90915590 has 16 divisors (see below), whose sum is σ = 164734560. Its totient is φ = 36124800.

The previous prime is 90915577. The next prime is 90915611. The reversal of 90915590 is 9551909.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28595 + ... + 31614.

It is an arithmetic number, because the mean of its divisors is an integer number (10295910).

Almost surely, 2^90915590 is an apocalyptic number.

90915590 is a deficient number, since it is larger than the sum of its proper divisors (73818970).

90915590 is a wasteful number, since it uses less digits than its factorization.

90915590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60367.

The product of its (nonzero) digits is 18225, while the sum is 38.

The square root of 90915590 is about 9534.9667015674. The cubic root of 90915590 is about 449.6550277913.

The spelling of 90915590 in words is "ninety million, nine hundred fifteen thousand, five hundred ninety".