64639025 has 12 divisors (see below), whose sum is σ = 87439344. Its totient is φ = 47010000.

The previous prime is 64639013. The next prime is 64639067. The reversal of 64639025 is 52093646.

It is not a de Polignac number, because 64639025 - 2⁶ = 64638961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117251 + ... + 117800.

It is an arithmetic number, because the mean of its divisors is an integer number (7286612).

Almost surely, 2^64639025 is an apocalyptic number.

It is an amenable number.

64639025 is a deficient number, since it is larger than the sum of its proper divisors (22800319).

64639025 is a wasteful number, since it uses less digits than its factorization.

64639025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235072 (or 235067 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 64639025 is about 8039.8398615893. The cubic root of 64639025 is about 401.3268955865.

The spelling of 64639025 in words is "sixty-four million, six hundred thirty-nine thousand, twenty-five".