90688665 has 16 divisors (see below), whose sum is σ = 149024448. Its totient is φ = 47059776.

The previous prime is 90688651. The next prime is 90688669. The reversal of 90688665 is 56688609.

It is not a de Polignac number, because 90688665 - 2⁴ = 90688649 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90688669) 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, 81147 + ... + 82256.

It is an arithmetic number, because the mean of its divisors is an integer number (9314028).

Almost surely, 2^90688665 is an apocalyptic number.

It is an amenable number.

90688665 is a deficient number, since it is larger than the sum of its proper divisors (58335783).

90688665 is a wasteful number, since it uses less digits than its factorization.

90688665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163448.

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 90688665 is about 9523.0596448830. The cubic root of 90688665 is about 449.2806036301.

The spelling of 90688665 in words is "ninety million, six hundred eighty-eight thousand, six hundred sixty-five".