64221564 has 24 divisors (see below), whose sum is σ = 163473408. Its totient is φ = 19461040.

The previous prime is 64221541. The next prime is 64221583. The reversal of 64221564 is 46512246.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 243132 + ... + 243395.

It is an arithmetic number, because the mean of its divisors is an integer number (6811392).

Almost surely, 2^64221564 is an apocalyptic number.

It is an amenable number.

64221564 is an abundant number, since it is smaller than the sum of its proper divisors (99251844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64221564 is a wasteful number, since it uses less digits than its factorization.

64221564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486545 (or 486543 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 64221564 is about 8013.8357856896. The cubic root of 64221564 is about 400.4610600216.

The spelling of 64221564 in words is "sixty-four million, two hundred twenty-one thousand, five hundred sixty-four".