90400172 has 6 divisors (see below), whose sum is σ = 158200308. Its totient is φ = 45200084.

The previous prime is 90400153. The next prime is 90400181. The reversal of 90400172 is 27100409.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11300018 + ... + 11300025.

It is an arithmetic number, because the mean of its divisors is an integer number (26366718).

Almost surely, 2^90400172 is an apocalyptic number.

It is an amenable number.

90400172 is a deficient number, since it is larger than the sum of its proper divisors (67800136).

90400172 is a wasteful number, since it uses less digits than its factorization.

90400172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22600047 (or 22600045 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 90400172 is about 9507.9005043174. The cubic root of 90400172 is about 448.8036899575.

The spelling of 90400172 in words is "ninety million, four hundred thousand, one hundred seventy-two".