90402172 has 24 divisors (see below), whose sum is σ = 181257440. Its totient is φ = 38646720.

The previous prime is 90402163. The next prime is 90402181. The reversal of 90402172 is 27120409.

It is an interprime number because it is at equal distance from previous prime (90402163) and next prime (90402181).

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, 7954 + ... + 15622.

Almost surely, 2^90402172 is an apocalyptic number.

It is an amenable number.

90402172 is an abundant number, since it is smaller than the sum of its proper divisors (90855268).

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

90402172 is a wasteful number, since it uses less digits than its factorization.

90402172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8101 (or 8099 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 90402172 is about 9508.0056794262. The cubic root of 90402172 is about 448.8069996885.

The spelling of 90402172 in words is "ninety million, four hundred two thousand, one hundred seventy-two".