256627780 has 24 divisors (see below), whose sum is σ = 539763840. Its totient is φ = 102490080.

The previous prime is 256627739. The next prime is 256627781. The reversal of 256627780 is 87726652.

256627780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256627781) 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, 3445 + ... + 22915.

It is an arithmetic number, because the mean of its divisors is an integer number (22490160).

Almost surely, 2^256627780 is an apocalyptic number.

256627780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256627780 is an abundant number, since it is smaller than the sum of its proper divisors (283136060).

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

256627780 is a wasteful number, since it uses less digits than its factorization.

256627780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20139 (or 20137 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 256627780 is about 16019.6061125110. The cubic root of 256627780 is about 635.4790276351.

The spelling of 256627780 in words is "two hundred fifty-six million, six hundred twenty-seven thousand, seven hundred eighty".