256571240 has 16 divisors (see below), whose sum is σ = 577285380. Its totient is φ = 102628480.

The previous prime is 256571219. The next prime is 256571267. The reversal of 256571240 is 42175652.

It can be written as a sum of positive squares in 2 ways, for example, as 212984836 + 43586404 = 14594^2 + 6602^2 .

It is a junction number, because it is equal to n+sod(n) for n = 256571197 and 256571206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3207101 + ... + 3207180.

Almost surely, 2^256571240 is an apocalyptic number.

256571240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256571240 is an abundant number, since it is smaller than the sum of its proper divisors (320714140).

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

256571240 is a wasteful number, since it uses less digits than its factorization.

256571240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6414292 (or 6414288 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 256571240 is about 16017.8413027474. The cubic root of 256571240 is about 635.4323548194.

The spelling of 256571240 in words is "two hundred fifty-six million, five hundred seventy-one thousand, two hundred forty".