64664217 has 16 divisors (see below), whose sum is σ = 98028480. Its totient is φ = 42106176.

The previous prime is 64664213. The next prime is 64664251. The reversal of 64664217 is 71246646.

64664217 is a `hidden beast` number, since 6 + 4 + 6 + 642 + 1 + 7 = 666.

It is not a de Polignac number, because 64664217 - 2² = 64664213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64664213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26688 + ... + 29009.

It is an arithmetic number, because the mean of its divisors is an integer number (6126780).

Almost surely, 2^64664217 is an apocalyptic number.

It is an amenable number.

64664217 is a deficient number, since it is larger than the sum of its proper divisors (33364263).

64664217 is a wasteful number, since it uses less digits than its factorization.

64664217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55749 (or 55743 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 64664217 is about 8041.4064068420. The cubic root of 64664217 is about 401.3790256736.

The spelling of 64664217 in words is "sixty-four million, six hundred sixty-four thousand, two hundred seventeen".