664902 has 32 divisors (see below), whose sum is σ = 1689600. Its totient is φ = 189864.

The previous prime is 664891. The next prime is 664933. The reversal of 664902 is 209466.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

664902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502 + ... + 1257.

It is an arithmetic number, because the mean of its divisors is an integer number (52800).

2⁶⁶⁴⁹⁰² is an apocalyptic number.

664902 is an abundant number, since it is smaller than the sum of its proper divisors (1024698).

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

664902 is a wasteful number, since it uses less digits than its factorization.

664902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777 (or 1771 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 664902 is about 815.4152316458. The cubic root of 664902 is about 87.2808994478.

The spelling of 664902 in words is "six hundred sixty-four thousand, nine hundred two".