664929072 has 60 divisors (see below), whose sum is σ = 1911187200. Its totient is φ = 215650944.

The previous prime is 664929071. The next prime is 664929079. The reversal of 664929072 is 270929466.

664929072 is a `hidden beast` number, since 6 + 6 + 492 + 90 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (664929071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57072 + ... + 67727.

It is an arithmetic number, because the mean of its divisors is an integer number (31853120).

Almost surely, 2^664929072 is an apocalyptic number.

It is an amenable number.

664929072 is an abundant number, since it is smaller than the sum of its proper divisors (1246258128).

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

664929072 is a wasteful number, since it uses less digits than its factorization.

664929072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124850 (or 124841 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 664929072 is about 25786.2186448498. The cubic root of 664929072 is about 872.8208400154.

It can be divided in two parts, 6649 and 29072, that added together give a square (35721 = 189²).

The spelling of 664929072 in words is "six hundred sixty-four million, nine hundred twenty-nine thousand, seventy-two".