64381256 has 8 divisors (see below), whose sum is σ = 120714870. Its totient is φ = 32190624.

The previous prime is 64381243. The next prime is 64381259. The reversal of 64381256 is 65218346.

It can be written as a sum of positive squares in only one way, i.e., 33756100 + 30625156 = 5810^2 + 5534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×64381256² = 8289892248275072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64381259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4023821 + ... + 4023836.

Almost surely, 2^64381256 is an apocalyptic number.

It is an amenable number.

64381256 is a deficient number, since it is larger than the sum of its proper divisors (56333614).

64381256 is a wasteful number, since it uses less digits than its factorization.

64381256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8047663 (or 8047659 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 64381256 is about 8023.7931179711. The cubic root of 64381256 is about 400.7927113175.

The spelling of 64381256 in words is "sixty-four million, three hundred eighty-one thousand, two hundred fifty-six".