664789536 has 36 divisors (see below), whose sum is σ = 1890496062. Its totient is φ = 221596416.

The previous prime is 664789523. The next prime is 664789627. The reversal of 664789536 is 635987466.

664789536 is a `hidden beast` number, since 66 + 47 + 8 + 9 + 536 = 666.

664789536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 544755600 + 120033936 = 23340^2 + 10956^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1153861 + ... + 1154436.

Almost surely, 2^664789536 is an apocalyptic number.

It is an amenable number.

664789536 is an abundant number, since it is smaller than the sum of its proper divisors (1225706526).

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

664789536 is a wasteful number, since it uses less digits than its factorization.

664789536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308313 (or 2308302 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 664789536 is about 25783.5128716007. The cubic root of 664789536 is about 872.7597816489.

The spelling of 664789536 in words is "six hundred sixty-four million, seven hundred eighty-nine thousand, five hundred thirty-six".