90170905902 has 64 divisors (see below), whose sum is σ = 225402905088. Its totient is φ = 23362560000.

The previous prime is 90170905871. The next prime is 90170905943. The reversal of 90170905902 is 20950907109.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58099 + ... + 428622.

It is an arithmetic number, because the mean of its divisors is an integer number (3521920392).

Almost surely, 2^90170905902 is an apocalyptic number.

90170905902 is an abundant number, since it is smaller than the sum of its proper divisors (135231999186).

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

90170905902 is a wasteful number, since it uses less digits than its factorization.

90170905902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487145.

The product of its (nonzero) digits is 51030, while the sum is 42.

The spelling of 90170905902 in words is "ninety billion, one hundred seventy million, nine hundred five thousand, nine hundred two".