664317976 has 96 divisors (see below), whose sum is σ = 1591604640. Its totient is φ = 253725696.

The previous prime is 664317937. The next prime is 664317991. The reversal of 664317976 is 679713466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342706 + ... + 344638.

It is an arithmetic number, because the mean of its divisors is an integer number (16579215).

Almost surely, 2^664317976 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 664317976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795802320).

664317976 is an abundant number, since it is smaller than the sum of its proper divisors (927286664).

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

664317976 is a wasteful number, since it uses less digits than its factorization.

664317976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001 (or 1978 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 49.

The square root of 664317976 is about 25774.3666459527. The cubic root of 664317976 is about 872.5533724873.

The spelling of 664317976 in words is "six hundred sixty-four million, three hundred seventeen thousand, nine hundred seventy-six".