256388872 has 8 divisors (see below), whose sum is σ = 480729150. Its totient is φ = 128194432.

The previous prime is 256388851. The next prime is 256388893. The reversal of 256388872 is 278883652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256388851) and next prime (256388893).

It can be written as a sum of positive squares in only one way, i.e., 146264836 + 110124036 = 12094^2 + 10494^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16024297 + ... + 16024312.

Almost surely, 2^256388872 is an apocalyptic number.

It is an amenable number.

256388872 is a deficient number, since it is larger than the sum of its proper divisors (224340278).

256388872 is a wasteful number, since it uses less digits than its factorization.

256388872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32048615 (or 32048611 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

The square root of 256388872 is about 16012.1476385899. The cubic root of 256388872 is about 635.2817663714.

The spelling of 256388872 in words is "two hundred fifty-six million, three hundred eighty-eight thousand, eight hundred seventy-two".