64571397 has 16 divisors (see below), whose sum is σ = 94804992. Its totient is φ = 38766320.

The previous prime is 64571393. The next prime is 64571407. The reversal of 64571397 is 79317546.

It is a cyclic number.

It is not a de Polignac number, because 64571397 - 2² = 64571393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64571393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5613 + ... + 12674.

It is an arithmetic number, because the mean of its divisors is an integer number (5925312).

Almost surely, 2^64571397 is an apocalyptic number.

It is an amenable number.

64571397 is a deficient number, since it is larger than the sum of its proper divisors (30233595).

64571397 is a wasteful number, since it uses less digits than its factorization.

64571397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18408.

The product of its digits is 158760, while the sum is 42.

The square root of 64571397 is about 8035.6329557789. The cubic root of 64571397 is about 401.1868851923.

The spelling of 64571397 in words is "sixty-four million, five hundred seventy-one thousand, three hundred ninety-seven".