64321256 has 8 divisors (see below), whose sum is σ = 120602370. Its totient is φ = 32160624.

The previous prime is 64321253. The next prime is 64321259. The reversal of 64321256 is 65212346.

It is an interprime number because it is at equal distance from previous prime (64321253) and next prime (64321259).

It can be written as a sum of positive squares in only one way, i.e., 48080356 + 16240900 = 6934^2 + 4030^2 .

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

It is not an unprimeable number, because it can be changed into a prime (64321253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4020071 + ... + 4020086.

Almost surely, 2^64321256 is an apocalyptic number.

It is an amenable number.

64321256 is a deficient number, since it is larger than the sum of its proper divisors (56281114).

64321256 is a wasteful number, since it uses less digits than its factorization.

64321256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8040163 (or 8040159 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 64321256 is about 8020.0533664060. The cubic root of 64321256 is about 400.6681665954.

The spelling of 64321256 in words is "sixty-four million, three hundred twenty-one thousand, two hundred fifty-six".