256046978 has 16 divisors (see below), whose sum is σ = 419268960. Its totient is φ = 116306400.

The previous prime is 256046977. The next prime is 256046981. The reversal of 256046978 is 879640652.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256046977) 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, 40598 + ... + 46478.

It is an arithmetic number, because the mean of its divisors is an integer number (26204310).

Almost surely, 2^256046978 is an apocalyptic number.

256046978 is a deficient number, since it is larger than the sum of its proper divisors (163221982).

256046978 is a wasteful number, since it uses less digits than its factorization.

256046978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7873.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 256046978 is about 16001.4679951559. The cubic root of 256046978 is about 634.9992584777. Note that the first 3 decimals are identical.

The spelling of 256046978 in words is "two hundred fifty-six million, forty-six thousand, nine hundred seventy-eight".