664653312 has 120 divisors (see below), whose sum is σ = 1939313376. Its totient is φ = 219119616.

The previous prime is 664653263. The next prime is 664653323. The reversal of 664653312 is 213356466.

664653312 is a `hidden beast` number, since 6 + 646 + 5 + 3 + 3 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 446233 + ... + 447719.

Almost surely, 2^664653312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664653312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969656688).

664653312 is an abundant number, since it is smaller than the sum of its proper divisors (1274660064).

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

664653312 is a wasteful number, since it uses less digits than its factorization.

664653312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608 (or 1589 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 664653312 is about 25780.8710481240. The cubic root of 664653312 is about 872.7001643095.

The spelling of 664653312 in words is "six hundred sixty-four million, six hundred fifty-three thousand, three hundred twelve".