256860920 has 16 divisors (see below), whose sum is σ = 577937160. Its totient is φ = 102744352.

The previous prime is 256860913. The next prime is 256860931. The reversal of 256860920 is 29068652.

It is a congruent number.

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, 3210722 + ... + 3210801.

Almost surely, 2^256860920 is an apocalyptic number.

256860920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256860920 is an abundant number, since it is smaller than the sum of its proper divisors (321076240).

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

256860920 is a wasteful number, since it uses less digits than its factorization.

256860920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6421534 (or 6421530 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 256860920 is about 16026.8811688363. The cubic root of 256860920 is about 635.6714083897.

The spelling of 256860920 in words is "two hundred fifty-six million, eight hundred sixty thousand, nine hundred twenty".