664612 has 12 divisors (see below), whose sum is σ = 1252636. Its totient is φ = 306720.

The previous prime is 664603. The next prime is 664613. The reversal of 664612 is 216466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 285156 + 379456 = 534^2 + 616^2 .

It is a super-2 number, since 2×664612² = 883418221088, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (664613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6339 + ... + 6442.

2⁶⁶⁴⁶¹² is an apocalyptic number.

It is an amenable number.

664612 is a deficient number, since it is larger than the sum of its proper divisors (588024).

664612 is a wasteful number, since it uses less digits than its factorization.

664612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12798 (or 12796 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 664612 is about 815.2373887402. The cubic root of 664612 is about 87.2682082835.

The spelling of 664612 in words is "six hundred sixty-four thousand, six hundred twelve".