64221579 has 20 divisors (see below), whose sum is σ = 96511536. Its totient is φ = 42557616.

The previous prime is 64221541. The next prime is 64221583. The reversal of 64221579 is 97512246.

64221579 is a `hidden beast` number, since 64 + 2 + 21 + 579 = 666.

It is not a de Polignac number, because 64221579 - 2²³ = 55832971 is a prime.

It is a super-2 number, since 2×64221579² = 8248822418506482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64221779) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11722 + ... + 16304.

Almost surely, 2^64221579 is an apocalyptic number.

64221579 is a deficient number, since it is larger than the sum of its proper divisors (32289957).

64221579 is a wasteful number, since it uses less digits than its factorization.

64221579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4768 (or 4759 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 64221579 is about 8013.8367215710. The cubic root of 64221579 is about 400.4610911997.

It can be divided in two parts, 6422 and 1579, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 64221579 in words is "sixty-four million, two hundred twenty-one thousand, five hundred seventy-nine".