90172556 has 48 divisors (see below), whose sum is σ = 178536960. Its totient is φ = 39594240.

The previous prime is 90172541. The next prime is 90172559. The reversal of 90172556 is 65527109.

It is not an unprimeable number, because it can be changed into a prime (90172559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91241 + ... + 92223.

It is an arithmetic number, because the mean of its divisors is an integer number (3719520).

Almost surely, 2^90172556 is an apocalyptic number.

It is an amenable number.

90172556 is a deficient number, since it is larger than the sum of its proper divisors (88364404).

90172556 is a wasteful number, since it uses less digits than its factorization.

90172556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 90172556 is about 9495.9231252154. The cubic root of 90172556 is about 448.4266967277.

The spelling of 90172556 in words is "ninety million, one hundred seventy-two thousand, five hundred fifty-six".