64636144 has 20 divisors (see below), whose sum is σ = 126526624. Its totient is φ = 31984128.

The previous prime is 64636133. The next prime is 64636163. The reversal of 64636144 is 44163646.

64636144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64636144² = 8355662222377472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19272 + ... + 22375.

Almost surely, 2^64636144 is an apocalyptic number.

It is an amenable number.

64636144 is a deficient number, since it is larger than the sum of its proper divisors (61890480).

64636144 is a wasteful number, since it uses less digits than its factorization.

64636144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41752 (or 41746 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 64636144 is about 8039.6606893575. The cubic root of 64636144 is about 401.3209330380.

The spelling of 64636144 in words is "sixty-four million, six hundred thirty-six thousand, one hundred forty-four".