664936 has 8 divisors (see below), whose sum is σ = 1246770. Its totient is φ = 332464.

The previous prime is 664933. The next prime is 664949. The reversal of 664936 is 639466.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 8836 = 810^2 + 94^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664936.

It is not an unprimeable number, because it can be changed into a prime (664933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41551 + ... + 41566.

2⁶⁶⁴⁹³⁶ is an apocalyptic number.

It is an amenable number.

664936 is a deficient number, since it is larger than the sum of its proper divisors (581834).

664936 is a wasteful number, since it uses less digits than its factorization.

664936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83123 (or 83119 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The square root of 664936 is about 815.4360796531. The cubic root of 664936 is about 87.2823871357.

It can be divided in two parts, 664 and 936, that added together give a square (1600 = 40²).

The spelling of 664936 in words is "six hundred sixty-four thousand, nine hundred thirty-six".