256851216 has 40 divisors (see below), whose sum is σ = 737259360. Its totient is φ = 85616928.

The previous prime is 256851211. The next prime is 256851223. The reversal of 256851216 is 612158652.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (256851211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296850 + ... + 297713.

It is an arithmetic number, because the mean of its divisors is an integer number (18431484).

Almost surely, 2^256851216 is an apocalyptic number.

It is an amenable number.

256851216 is an abundant number, since it is smaller than the sum of its proper divisors (480408144).

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

256851216 is a wasteful number, since it uses less digits than its factorization.

256851216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594580 (or 594568 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 256851216 is about 16026.5784246045. The cubic root of 256851216 is about 635.6634032366.

The spelling of 256851216 in words is "two hundred fifty-six million, eight hundred fifty-one thousand, two hundred sixteen".