90117888 has 72 divisors (see below), whose sum is σ = 274124928. Its totient is φ = 25746432.

The previous prime is 90117883. The next prime is 90117917. The reversal of 90117888 is 88871109.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90117883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3006 + ... + 13757.

Almost surely, 2^90117888 is an apocalyptic number.

It is an amenable number.

90117888 is an abundant number, since it is smaller than the sum of its proper divisors (184007040).

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

90117888 is a wasteful number, since it uses less digits than its factorization.

90117888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16789 (or 16775 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 90117888 is about 9493.0441903533. The cubic root of 90117888 is about 448.3360573747.

The spelling of 90117888 in words is "ninety million, one hundred seventeen thousand, eight hundred eighty-eight".