64172816 has 10 divisors (see below), whose sum is σ = 124334862. Its totient is φ = 32086400.

The previous prime is 64172809. The next prime is 64172833. The reversal of 64172816 is 61827146.

It can be written as a sum of positive squares in only one way, i.e., 51782416 + 12390400 = 7196^2 + 3520^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2005385 + ... + 2005416.

Almost surely, 2^64172816 is an apocalyptic number.

It is an amenable number.

64172816 is a deficient number, since it is larger than the sum of its proper divisors (60162046).

64172816 is a wasteful number, since it uses less digits than its factorization.

64172816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010809 (or 4010803 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 64172816 is about 8010.7937184776. The cubic root of 64172816 is about 400.3597097586.

The spelling of 64172816 in words is "sixty-four million, one hundred seventy-two thousand, eight hundred sixteen".