90565977 has 16 divisors (see below), whose sum is σ = 123731712. Its totient is φ = 58906320.

The previous prime is 90565961. The next prime is 90565991. The reversal of 90565977 is 77956509.

It is not a de Polignac number, because 90565977 - 2⁴ = 90565961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90565957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19402 + ... + 23612.

It is an arithmetic number, because the mean of its divisors is an integer number (7733232).

Almost surely, 2^90565977 is an apocalyptic number.

It is an amenable number.

90565977 is a deficient number, since it is larger than the sum of its proper divisors (33165735).

90565977 is a wasteful number, since it uses less digits than its factorization.

90565977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388.

The product of its (nonzero) digits is 595350, while the sum is 48.

The square root of 90565977 is about 9516.6158375759. The cubic root of 90565977 is about 449.0779093745.

The spelling of 90565977 in words is "ninety million, five hundred sixty-five thousand, nine hundred seventy-seven".