256170440 has 16 divisors (see below), whose sum is σ = 576383580. Its totient is φ = 102468160.

The previous prime is 256170437. The next prime is 256170449. The reversal of 256170440 is 44071652.

256170440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 255808036 + 362404 = 15994^2 + 602^2 .

It is not an unprimeable number, because it can be changed into a prime (256170449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3202091 + ... + 3202170.

Almost surely, 2^256170440 is an apocalyptic number.

256170440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256170440 is an abundant number, since it is smaller than the sum of its proper divisors (320213140).

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

256170440 is a wasteful number, since it uses less digits than its factorization.

256170440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6404272 (or 6404268 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 256170440 is about 16005.3253637656. The cubic root of 256170440 is about 635.1013044402.

The spelling of 256170440 in words is "two hundred fifty-six million, one hundred seventy thousand, four hundred forty".