664725064 has 32 divisors (see below), whose sum is σ = 1289836800. Its totient is φ = 320823360.

The previous prime is 664725059. The next prime is 664725067. The reversal of 664725064 is 460527466.

It is not an unprimeable number, because it can be changed into a prime (664725067) 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, 100714 + ... + 107110.

It is an arithmetic number, because the mean of its divisors is an integer number (40307400).

Almost surely, 2^664725064 is an apocalyptic number.

It is an amenable number.

664725064 is a deficient number, since it is larger than the sum of its proper divisors (625111736).

664725064 is a wasteful number, since it uses less digits than its factorization.

664725064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6853 (or 6849 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 664725064 is about 25782.2625849633. The cubic root of 664725064 is about 872.7315670112.

The spelling of 664725064 in words is "six hundred sixty-four million, seven hundred twenty-five thousand, sixty-four".