64936639 has 8 divisors (see below), whose sum is σ = 66946320. Its totient is φ = 62957376.

The previous prime is 64936631. The next prime is 64936643. The reversal of 64936639 is 93663946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64936639 - 2³ = 64936631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64936631) 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, 3232 + ... + 11845.

It is an arithmetic number, because the mean of its divisors is an integer number (8368290).

Almost surely, 2^64936639 is an apocalyptic number.

64936639 is a deficient number, since it is larger than the sum of its proper divisors (2009681).

64936639 is a wasteful number, since it uses less digits than its factorization.

64936639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15209.

The product of its digits is 629856, while the sum is 46.

The square root of 64936639 is about 8058.3273078226. The cubic root of 64936639 is about 401.9418886653.

The spelling of 64936639 in words is "sixty-four million, nine hundred thirty-six thousand, six hundred thirty-nine".