64641056 has 24 divisors (see below), whose sum is σ = 128697660. Its totient is φ = 31955968.

The previous prime is 64641043. The next prime is 64641077. The reversal of 64641056 is 65014646.

It can be written as a sum of positive squares in 2 ways, for example, as 47831056 + 16810000 = 6916^2 + 4100^2 .

It is a super-2 number, since 2×64641056² = 8356932241590272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8501 + ... + 14196.

Almost surely, 2^64641056 is an apocalyptic number.

It is an amenable number.

64641056 is a deficient number, since it is larger than the sum of its proper divisors (64056604).

64641056 is a wasteful number, since it uses less digits than its factorization.

64641056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22796 (or 22788 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 64641056 is about 8039.9661690831. The cubic root of 64641056 is about 401.3310988594.

The spelling of 64641056 in words is "sixty-four million, six hundred forty-one thousand, fifty-six".