256883691 has 16 divisors (see below), whose sum is σ = 347034240. Its totient is φ = 169008000.

The previous prime is 256883689. The next prime is 256883713. The reversal of 256883691 is 196388652.

It is a happy number.

It is not a de Polignac number, because 256883691 - 2¹ = 256883689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256883691.

It is not an unprimeable number, because it can be changed into a prime (256883611) 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, 83580 + ... + 86598.

It is an arithmetic number, because the mean of its divisors is an integer number (21689640).

Almost surely, 2^256883691 is an apocalyptic number.

256883691 is a deficient number, since it is larger than the sum of its proper divisors (90150549).

256883691 is a wasteful number, since it uses less digits than its factorization.

256883691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386.

The product of its digits is 622080, while the sum is 48.

The square root of 256883691 is about 16027.5915533183. The cubic root of 256883691 is about 635.6901921553.

The spelling of 256883691 in words is "two hundred fifty-six million, eight hundred eighty-three thousand, six hundred ninety-one".