664716 has 24 divisors (see below), whose sum is σ = 1670704. Its totient is φ = 204480.

The previous prime is 664711. The next prime is 664739. The reversal of 664716 is 617466.

664716 = T₂₁₃ + T₂₁₄ + ... + T₂₃₈.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664716.

It is not an unprimeable number, because it can be changed into a prime (664711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1975 + ... + 2286.

2⁶⁶⁴⁷¹⁶ is an apocalyptic number.

It is an amenable number.

664716 is an abundant number, since it is smaller than the sum of its proper divisors (1005988).

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

664716 is a wasteful number, since it uses less digits than its factorization.

664716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4281 (or 4279 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 664716 is about 815.3011713471. The cubic root of 664716 is about 87.2727600221.

The spelling of 664716 in words is "six hundred sixty-four thousand, seven hundred sixteen".