91499730 has 64 divisors (see below), whose sum is σ = 255737088. Its totient is φ = 20517120.

The previous prime is 91499713. The next prime is 91499731. The reversal of 91499730 is 3799419.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (91499731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7020 + ... + 15240.

It is an arithmetic number, because the mean of its divisors is an integer number (3995892).

Almost surely, 2^91499730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91499730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127868544).

91499730 is an abundant number, since it is smaller than the sum of its proper divisors (164237358).

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

91499730 is a wasteful number, since it uses less digits than its factorization.

91499730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 91499730 is about 9565.5491217180. The cubic root of 91499730 is about 450.6159958971.

It can be divided in two parts, 91499 and 730, that added together give a palindrome (92229).

The spelling of 91499730 in words is "ninety-one million, four hundred ninety-nine thousand, seven hundred thirty".