90291520 has 112 divisors (see below), whose sum is σ = 237670848. Its totient is φ = 32399360.

The previous prime is 90291517. The next prime is 90291521. The reversal of 90291520 is 2519209.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90291521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397647 + ... + 397873.

Almost surely, 2^90291520 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 90291520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118835424).

90291520 is an abundant number, since it is smaller than the sum of its proper divisors (147379328).

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

90291520 is a wasteful number, since it uses less digits than its factorization.

90291520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 90291520 is about 9502.1850118802. The cubic root of 90291520 is about 448.6238120998.

The spelling of 90291520 in words is "ninety million, two hundred ninety-one thousand, five hundred twenty".