256983678 has 48 divisors (see below), whose sum is σ = 659917440. Its totient is φ = 73422936.

The previous prime is 256983653. The next prime is 256983737. The reversal of 256983678 is 876389652.

It is a happy number.

256983678 is a `hidden beast` number, since 2 + 569 + 8 + 3 + 6 + 78 = 666.

It is a super-2 number, since 2×256983678² = 132081221516815368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an alternating number because its digits alternate between even and odd.

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, 34368 + ... + 41171.

It is an arithmetic number, because the mean of its divisors is an integer number (13748280).

Almost surely, 2^256983678 is an apocalyptic number.

256983678 is an abundant number, since it is smaller than the sum of its proper divisors (402933762).

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

256983678 is an equidigital number, since it uses as much as digits as its factorization.

256983678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75563 (or 75551 counting only the distinct ones).

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

The square root of 256983678 is about 16030.7104646051. The cubic root of 256983678 is about 635.7726581541.

The spelling of 256983678 in words is "two hundred fifty-six million, nine hundred eighty-three thousand, six hundred seventy-eight".