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91428 = 22319401
BaseRepresentation
bin10110010100100100
311122102020
4112110210
510411203
61543140
7530361
oct262444
9148366
1091428
1162767
1244ab0
13327cc
1425468
151c153
hex16524

91428 has 24 divisors (see below), whose sum is σ = 225120. Its totient is φ = 28800.

The previous prime is 91423. The next prime is 91433. The reversal of 91428 is 82419.

It is an interprime number because it is at equal distance from previous prime (91423) and next prime (91433).

It is a junction number, because it is equal to n+sod(n) for n = 91398 and 91407.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91428.

It is not an unprimeable number, because it can be changed into a prime (91423) by changing a digit.

91428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28 + ... + 428.

It is an arithmetic number, because the mean of its divisors is an integer number (9380).

291428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112560).

91428 is an abundant number, since it is smaller than the sum of its proper divisors (133692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91428 is a wasteful number, since it uses less digits than its factorization.

91428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 425 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 91428 is about 302.3706334947. The cubic root of 91428 is about 45.0498213636.

Subtracting from 91428 its reverse (82419), we obtain a palindrome (9009).

The spelling of 91428 in words is "ninety-one thousand, four hundred twenty-eight".

Divisors: 1 2 3 4 6 12 19 38 57 76 114 228 401 802 1203 1604 2406 4812 7619 15238 22857 30476 45714 91428