256880247 has 16 divisors (see below), whose sum is σ = 388268160. Its totient is φ = 149759712.

The previous prime is 256880243. The next prime is 256880263. The reversal of 256880247 is 742088652.

It is a happy number.

It is not a de Polignac number, because 256880247 - 2² = 256880243 is a prime.

It is a super-2 number, since 2×256880247² = 131974922597562018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256880199 and 256880208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256880243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172593 + ... + 174074.

It is an arithmetic number, because the mean of its divisors is an integer number (24266760).

Almost surely, 2^256880247 is an apocalyptic number.

256880247 is a deficient number, since it is larger than the sum of its proper divisors (131387913).

256880247 is a wasteful number, since it uses less digits than its factorization.

256880247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346702.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 256880247 is about 16027.4841132350. The cubic root of 256880247 is about 635.6873512759.

The spelling of 256880247 in words is "two hundred fifty-six million, eight hundred eighty thousand, two hundred forty-seven".