64639605 has 16 divisors (see below), whose sum is σ = 103582080. Its totient is φ = 34421568.

The previous prime is 64639541. The next prime is 64639643. The reversal of 64639605 is 50693646.

It is a happy number.

It is not a de Polignac number, because 64639605 - 2⁶ = 64639541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8056 + ... + 13934.

It is an arithmetic number, because the mean of its divisors is an integer number (6473880).

Almost surely, 2^64639605 is an apocalyptic number.

It is an amenable number.

64639605 is a deficient number, since it is larger than the sum of its proper divisors (38942475).

64639605 is a wasteful number, since it uses less digits than its factorization.

64639605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6620.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 64639605 is about 8039.8759318786. The cubic root of 64639605 is about 401.3280959393.

The spelling of 64639605 in words is "sixty-four million, six hundred thirty-nine thousand, six hundred five".