64440656 has 40 divisors (see below), whose sum is σ = 143115840. Its totient is φ = 27535104.

The previous prime is 64440653. The next prime is 64440671. The reversal of 64440656 is 65604446.

64440656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440653) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 50555 + ... + 51813.

It is an arithmetic number, because the mean of its divisors is an integer number (3577896).

Almost surely, 2^64440656 is an apocalyptic number.

It is an amenable number.

64440656 is an abundant number, since it is smaller than the sum of its proper divisors (78675184).

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

64440656 is a wasteful number, since it uses less digits than its factorization.

64440656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 64440656 is about 8027.4937558369. The cubic root of 64440656 is about 400.9159343929.

The spelling of 64440656 in words is "sixty-four million, four hundred forty thousand, six hundred fifty-six".