64639408 has 20 divisors (see below), whose sum is σ = 125586208. Its totient is φ = 32230080.

The previous prime is 64639403. The next prime is 64639409. The reversal of 64639408 is 80493646.

64639408 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 (64639403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553 + ... + 11383.

Almost surely, 2^64639408 is an apocalyptic number.

It is an amenable number.

64639408 is a deficient number, since it is larger than the sum of its proper divisors (60946800).

64639408 is a wasteful number, since it uses less digits than its factorization.

64639408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11212 (or 11206 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 64639408 is about 8039.8636804364. The cubic root of 64639408 is about 401.3276882341.

The spelling of 64639408 in words is "sixty-four million, six hundred thirty-nine thousand, four hundred eight".