256197879 has 48 divisors (see below), whose sum is σ = 438197760. Its totient is φ = 141186240.

The previous prime is 256197863. The next prime is 256197917. The reversal of 256197879 is 978791652.

256197879 is a `hidden beast` number, since 2 + 561 + 9 + 7 + 8 + 79 = 666.

It is not a de Polignac number, because 256197879 - 2⁴ = 256197863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256197829) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 304942 + ... + 305780.

It is an arithmetic number, because the mean of its divisors is an integer number (9129120).

Almost surely, 2^256197879 is an apocalyptic number.

256197879 is a deficient number, since it is larger than the sum of its proper divisors (181999881).

256197879 is a wasteful number, since it uses less digits than its factorization.

256197879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1017 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 256197879 is about 16006.1825242623. The cubic root of 256197879 is about 635.1239793470.

It can be divided in two parts, 256 and 197879, that added together give a triangular number (198135 = T₆₂₉).

The spelling of 256197879 in words is "two hundred fifty-six million, one hundred ninety-seven thousand, eight hundred seventy-nine".