90431684 has 12 divisors (see below), whose sum is σ = 180863424. Its totient is φ = 38756424.

The previous prime is 90431641. The next prime is 90431717. The reversal of 90431684 is 48613409.

90431684 is an admirable number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 1614824 + ... + 1614879.

It is an arithmetic number, because the mean of its divisors is an integer number (15071952).

Almost surely, 2^90431684 is an apocalyptic number.

It is an amenable number.

90431684 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.

90431684 is a wasteful number, since it uses less digits than its factorization.

90431684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229714 (or 3229712 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 90431684 is about 9509.5575081073. The cubic root of 90431684 is about 448.8558324058.

The spelling of 90431684 in words is "ninety million, four hundred thirty-one thousand, six hundred eighty-four".