664864480 has 48 divisors (see below), whose sum is σ = 1795137120. Its totient is φ = 227953152.

The previous prime is 664864477. The next prime is 664864493. The reversal of 664864480 is 84468466.

It is a self number, because there is not a number n which added to its sum of digits gives 664864480.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295695 + ... + 297934.

It is an arithmetic number, because the mean of its divisors is an integer number (37398690).

Almost surely, 2^664864480 is an apocalyptic number.

It is an amenable number.

664864480 is an abundant number, since it is smaller than the sum of its proper divisors (1130272640).

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

664864480 is a wasteful number, since it uses less digits than its factorization.

664864480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593651 (or 593643 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 46.

The square root of 664864480 is about 25784.9661624754. The cubic root of 664864480 is about 872.7925768158.

The spelling of 664864480 in words is "six hundred sixty-four million, eight hundred sixty-four thousand, four hundred eighty".