85665990 has 32 divisors (see below), whose sum is σ = 206841600. Its totient is φ = 22706144.

The previous prime is 85665977. The next prime is 85666001. The reversal of 85665990 is 9956658.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3540 + ... + 13559.

It is an arithmetic number, because the mean of its divisors is an integer number (6463800).

Almost surely, 2^85665990 is an apocalyptic number.

85665990 is an abundant number, since it is smaller than the sum of its proper divisors (121175610).

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

85665990 is a wasteful number, since it uses less digits than its factorization.

85665990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17276.

The product of its (nonzero) digits is 583200, while the sum is 48.

The square root of 85665990 is about 9255.5923635389. The cubic root of 85665990 is about 440.8283122900.

The spelling of 85665990 in words is "eighty-five million, six hundred sixty-five thousand, nine hundred ninety".