664986312 has 24 divisors (see below), whose sum is σ = 1801004790. Its totient is φ = 221662080.

The previous prime is 664986307. The next prime is 664986319. The reversal of 664986312 is 213689466.

664986312 is a `hidden beast` number, since 6 + 6 + 4 + 9 + 8 + 631 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 336869316 + 328116996 = 18354^2 + 18114^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×664986312² = 884413590294722688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (664986319) 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, 4617889 + ... + 4618032.

Almost surely, 2^664986312 is an apocalyptic number.

It is an amenable number.

664986312 is an abundant number, since it is smaller than the sum of its proper divisors (1136018478).

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

664986312 is a wasteful number, since it uses less digits than its factorization.

664986312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9235933 (or 9235926 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 664986312 is about 25787.3285161530. The cubic root of 664986312 is about 872.8458847074.

The spelling of 664986312 in words is "six hundred sixty-four million, nine hundred eighty-six thousand, three hundred twelve".