664792064 has 88 divisors (see below), whose sum is σ = 1430607360. Its totient is φ = 307777536.

The previous prime is 664792057. The next prime is 664792067. The reversal of 664792064 is 460297466.

664792064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (664792067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 914069 + ... + 914795.

Almost surely, 2^664792064 is an apocalyptic number.

664792064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664792064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (715303680).

664792064 is an abundant number, since it is smaller than the sum of its proper divisors (765815296).

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

664792064 is a wasteful number, since it uses less digits than its factorization.

664792064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 664792064 is about 25783.5618951300. The cubic root of 664792064 is about 872.7608879308.

The spelling of 664792064 in words is "six hundred sixty-four million, seven hundred ninety-two thousand, sixty-four".