64572381 has 12 divisors (see below), whose sum is σ = 94098108. Its totient is φ = 42666624.

The previous prime is 64572377. The next prime is 64572383. The reversal of 64572381 is 18327546.

64572381 is a `hidden beast` number, since 6 + 4 + 572 + 3 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1512900 + 63059481 = 1230^2 + 7941^2 .

It is not a de Polignac number, because 64572381 - 2² = 64572377 is a prime.

It is a super-2 number, since 2×64572381² = 8339184776018322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64572383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30730 + ... + 32763.

It is an arithmetic number, because the mean of its divisors is an integer number (7841509).

Almost surely, 2^64572381 is an apocalyptic number.

It is an amenable number.

64572381 is a deficient number, since it is larger than the sum of its proper divisors (29525727).

64572381 is a wasteful number, since it uses less digits than its factorization.

64572381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63612 (or 63609 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 64572381 is about 8035.6941828320. The cubic root of 64572381 is about 401.1889230703.

The spelling of 64572381 in words is "sixty-four million, five hundred seventy-two thousand, three hundred eighty-one".