90390188 has 12 divisors (see below), whose sum is σ = 180780432. Its totient is φ = 38738640.

The previous prime is 90390137. The next prime is 90390217. The reversal of 90390188 is 88109309.

90390188 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1614083 + ... + 1614138.

It is an arithmetic number, because the mean of its divisors is an integer number (15065036).

Almost surely, 2^90390188 is an apocalyptic number.

It is an amenable number.

90390188 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

90390188 is a wasteful number, since it uses less digits than its factorization.

90390188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228232 (or 3228230 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 90390188 is about 9507.3754527735. The cubic root of 90390188 is about 448.7871670501.

The spelling of 90390188 in words is "ninety million, three hundred ninety thousand, one hundred eighty-eight".