664974 has 12 divisors (see below), whose sum is σ = 1440816. Its totient is φ = 221652.

The previous prime is 664973. The next prime is 664997. The reversal of 664974 is 479466.

664974 is a `hidden beast` number, since 6 + 649 + 7 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18454 + ... + 18489.

It is an arithmetic number, because the mean of its divisors is an integer number (120068).

2⁶⁶⁴⁹⁷⁴ is an apocalyptic number.

664974 is an abundant number, since it is smaller than the sum of its proper divisors (775842).

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

664974 is a wasteful number, since it uses less digits than its factorization.

664974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36951 (or 36948 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 664974 is about 815.4593797364. The cubic root of 664974 is about 87.2840497857.

It can be divided in two parts, 6 and 64974, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 664974 in words is "six hundred sixty-four thousand, nine hundred seventy-four".