64387656 has 128 divisors (see below), whose sum is σ = 195120000. Its totient is φ = 19595520.

The previous prime is 64387639. The next prime is 64387657. The reversal of 64387656 is 65678346.

It is not an unprimeable number, because it can be changed into a prime (64387657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118746 + ... + 119286.

It is an arithmetic number, because the mean of its divisors is an integer number (1524375).

Almost surely, 2^64387656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64387656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97560000).

64387656 is an abundant number, since it is smaller than the sum of its proper divisors (130732344).

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

64387656 is a wasteful number, since it uses less digits than its factorization.

64387656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 594 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 64387656 is about 8024.1919219321. The cubic root of 64387656 is about 400.8059915200.

The spelling of 64387656 in words is "sixty-four million, three hundred eighty-seven thousand, six hundred fifty-six".