256778130 has 48 divisors (see below), whose sum is σ = 716886720. Its totient is φ = 58691808.

The previous prime is 256778117. The next prime is 256778131. The reversal of 256778130 is 31877652.

It is not an unprimeable number, because it can be changed into a prime (256778131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85870 + ... + 88809.

It is an arithmetic number, because the mean of its divisors is an integer number (14935140).

Almost surely, 2^256778130 is an apocalyptic number.

256778130 is an abundant number, since it is smaller than the sum of its proper divisors (460108590).

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

256778130 is a wasteful number, since it uses less digits than its factorization.

256778130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174703 (or 174696 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 256778130 is about 16024.2981125539. The cubic root of 256778130 is about 635.6031056794.

The spelling of 256778130 in words is "two hundred fifty-six million, seven hundred seventy-eight thousand, one hundred thirty".