664836 has 24 divisors (see below), whose sum is σ = 1643040. Its totient is φ = 208512.

The previous prime is 664799. The next prime is 664843. The reversal of 664836 is 638466.

It is a junction number, because it is equal to n+sod(n) for n = 664797 and 664806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1426 + ... + 1833.

It is an arithmetic number, because the mean of its divisors is an integer number (68460).

2⁶⁶⁴⁸³⁶ is an apocalyptic number.

It is an amenable number.

664836 is an abundant number, since it is smaller than the sum of its proper divisors (978204).

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

664836 is a wasteful number, since it uses less digits than its factorization.

664836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283 (or 3281 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 664836 is about 815.3747604629. The cubic root of 664836 is about 87.2780114383.

The spelling of 664836 in words is "six hundred sixty-four thousand, eight hundred thirty-six".