90315920 has 20 divisors (see below), whose sum is σ = 209984700. Its totient is φ = 36126336.

The previous prime is 90315913. The next prime is 90315931. The reversal of 90315920 is 2951309.

It can be written as a sum of positive squares in 2 ways, for example, as 27081616 + 63234304 = 5204^2 + 7952^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564395 + ... + 564554.

It is an arithmetic number, because the mean of its divisors is an integer number (10499235).

Almost surely, 2^90315920 is an apocalyptic number.

It is an amenable number.

90315920 is an abundant number, since it is smaller than the sum of its proper divisors (119668780).

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

90315920 is a wasteful number, since it uses less digits than its factorization.

90315920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128962 (or 1128956 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 90315920 is about 9503.4688403761. The cubic root of 90315920 is about 448.6642198632.

The spelling of 90315920 in words is "ninety million, three hundred fifteen thousand, nine hundred twenty".