256343872 has 14 divisors (see below), whose sum is σ = 508682498. Its totient is φ = 128171904.

The previous prime is 256343869. The next prime is 256343873. The reversal of 256343872 is 278343652.

It can be written as a sum of positive squares in only one way, i.e., 226924096 + 29419776 = 15064^2 + 5424^2 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256343873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2002623 + ... + 2002750.

Almost surely, 2^256343872 is an apocalyptic number.

It is an amenable number.

256343872 is a deficient number, since it is larger than the sum of its proper divisors (252338626).

256343872 is an equidigital number, since it uses as much as digits as its factorization.

256343872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4005385 (or 4005375 counting only the distinct ones).

The product of its digits is 241920, while the sum is 40.

The square root of 256343872 is about 16010.7423937805. The cubic root of 256343872 is about 635.2445971137.

The spelling of 256343872 in words is "two hundred fifty-six million, three hundred forty-three thousand, eight hundred seventy-two".