64639714 has 4 divisors (see below), whose sum is σ = 96959574. Its totient is φ = 32319856.

The previous prime is 64639709. The next prime is 64639717. The reversal of 64639714 is 41793646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 47375689 + 17264025 = 6883^2 + 4155^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (64639717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16159927 + ... + 16159930.

Almost surely, 2^64639714 is an apocalyptic number.

64639714 is a deficient number, since it is larger than the sum of its proper divisors (32319860).

64639714 is a wasteful number, since it uses less digits than its factorization.

64639714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32319859.

The product of its digits is 108864, while the sum is 40.

The square root of 64639714 is about 8039.8827105873. The cubic root of 64639714 is about 401.3283215220.

The spelling of 64639714 in words is "sixty-four million, six hundred thirty-nine thousand, seven hundred fourteen".