256847228 has 24 divisors (see below), whose sum is σ = 491191344. Its totient is φ = 116547200.

The previous prime is 256847219. The next prime is 256847267. The reversal of 256847228 is 822748652.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22418 + ... + 31878.

It is an arithmetic number, because the mean of its divisors is an integer number (20466306).

Almost surely, 2^256847228 is an apocalyptic number.

256847228 is the 8567-th centered heptagonal number.

It is an amenable number.

256847228 is a deficient number, since it is larger than the sum of its proper divisors (234344116).

256847228 is a wasteful number, since it uses less digits than its factorization.

256847228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10093 (or 10091 counting only the distinct ones).

The product of its digits is 430080, while the sum is 44.

The square root of 256847228 is about 16026.4540057993. The cubic root of 256847228 is about 635.6601133439.

The spelling of 256847228 in words is "two hundred fifty-six million, eight hundred forty-seven thousand, two hundred twenty-eight".