85664172 has 24 divisors (see below), whose sum is σ = 218054592. Its totient is φ = 25958800.

The previous prime is 85664149. The next prime is 85664177. The reversal of 85664172 is 27146658.

It is a self number, because there is not a number n which added to its sum of digits gives 85664172.

It is not an unprimeable number, because it can be changed into a prime (85664177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324354 + ... + 324617.

It is an arithmetic number, because the mean of its divisors is an integer number (9085608).

Almost surely, 2^85664172 is an apocalyptic number.

It is an amenable number.

85664172 is an abundant number, since it is smaller than the sum of its proper divisors (132390420).

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

85664172 is a wasteful number, since it uses less digits than its factorization.

85664172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648989 (or 648987 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 85664172 is about 9255.4941521239. The cubic root of 85664172 is about 440.8251938547.

The spelling of 85664172 in words is "eighty-five million, six hundred sixty-four thousand, one hundred seventy-two".