90985644 has 36 divisors (see below), whose sum is σ = 237924960. Its totient is φ = 29282400.

The previous prime is 90985637. The next prime is 90985681. The reversal of 90985644 is 44658909.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 90985644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42532 + ... + 44619.

Almost surely, 2^90985644 is an apocalyptic number.

It is an amenable number.

90985644 is an abundant number, since it is smaller than the sum of its proper divisors (146939316).

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

90985644 is a wasteful number, since it uses less digits than its factorization.

90985644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87190 (or 87185 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 90985644 is about 9538.6395256347. The cubic root of 90985644 is about 449.7704903725.

The spelling of 90985644 in words is "ninety million, nine hundred eighty-five thousand, six hundred forty-four".