256678878 has 16 divisors (see below), whose sum is σ = 518651280. Its totient is φ = 84677376.

The previous prime is 256678867. The next prime is 256678907. The reversal of 256678878 is 878876652.

It is a happy number.

It is a super-2 number, since 2×256678878² = 131768092822677768, which contains 22 as substring.

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, 219933 + ... + 221096.

It is an arithmetic number, because the mean of its divisors is an integer number (32415705).

Almost surely, 2^256678878 is an apocalyptic number.

256678878 is an abundant number, since it is smaller than the sum of its proper divisors (261972402).

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

256678878 is a wasteful number, since it uses less digits than its factorization.

256678878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441131.

The product of its digits is 9031680, while the sum is 57.

The square root of 256678878 is about 16021.2008913190. The cubic root of 256678878 is about 635.5212022748.

The spelling of 256678878 in words is "two hundred fifty-six million, six hundred seventy-eight thousand, eight hundred seventy-eight".