90745720 has 96 divisors (see below), whose sum is σ = 227505600. Its totient is φ = 32378112.

The previous prime is 90745687. The next prime is 90745723. The reversal of 90745720 is 2754709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90745723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1148641 + ... + 1148719.

It is an arithmetic number, because the mean of its divisors is an integer number (2369850).

Almost surely, 2^90745720 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 90745720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113752800).

90745720 is an abundant number, since it is smaller than the sum of its proper divisors (136759880).

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

90745720 is a wasteful number, since it uses less digits than its factorization.

90745720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 90745720 is about 9526.0547972390. The cubic root of 90745720 is about 449.3748025801.

The spelling of 90745720 in words is "ninety million, seven hundred forty-five thousand, seven hundred twenty".