64657971 has 24 divisors (see below), whose sum is σ = 110183424. Its totient is φ = 35754480.

The previous prime is 64657937. The next prime is 64657973. The reversal of 64657971 is 17975646.

It is a happy number.

64657971 is a `hidden beast` number, since 6 + 4 + 6 + 579 + 71 = 666.

It is not a de Polignac number, because 64657971 - 2⁹ = 64657459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64657973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14601 + ... + 18506.

It is an arithmetic number, because the mean of its divisors is an integer number (4590976).

Almost surely, 2^64657971 is an apocalyptic number.

64657971 is a deficient number, since it is larger than the sum of its proper divisors (45525453).

64657971 is a wasteful number, since it uses less digits than its factorization.

64657971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33151 (or 33148 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 64657971 is about 8041.0180325628. The cubic root of 64657971 is about 401.3661020185.

The spelling of 64657971 in words is "sixty-four million, six hundred fifty-seven thousand, nine hundred seventy-one".