256973886 has 48 divisors (see below), whose sum is σ = 607239360. Its totient is φ = 78062400.

The previous prime is 256973869. The next prime is 256973909. The reversal of 256973886 is 688379652.

It is a happy number.

256973886 is a `hidden beast` number, since 2 + 569 + 73 + 8 + 8 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11536 + ... + 25436.

It is an arithmetic number, because the mean of its divisors is an integer number (12650820).

Almost surely, 2^256973886 is an apocalyptic number.

256973886 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 256973886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303619680).

256973886 is an abundant number, since it is smaller than the sum of its proper divisors (350265474).

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

256973886 is a wasteful number, since it uses less digits than its factorization.

256973886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14001 (or 13998 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 256973886 is about 16030.4050479082. The cubic root of 256973886 is about 635.7645829785.

The spelling of 256973886 in words is "two hundred fifty-six million, nine hundred seventy-three thousand, eight hundred eighty-six".