90987777644 has 24 divisors (see below), whose sum is σ = 161871682560. Its totient is φ = 44740965456.

The previous prime is 90987777637. The next prime is 90987777677. The reversal of 90987777644 is 44677778909.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116984 + ... + 442335.

It is an arithmetic number, because the mean of its divisors is an integer number (6744653440).

Almost surely, 2^90987777644 is an apocalyptic number.

It is an amenable number.

90987777644 is a deficient number, since it is larger than the sum of its proper divisors (70883904916).

90987777644 is a wasteful number, since it uses less digits than its factorization.

90987777644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559997 (or 559995 counting only the distinct ones).

The product of its (nonzero) digits is 149361408, while the sum is 68.

The spelling of 90987777644 in words is "ninety billion, nine hundred eighty-seven million, seven hundred seventy-seven thousand, six hundred forty-four".