2556790878 has 16 divisors (see below), whose sum is σ = 5117904000. Its totient is φ = 851543256.

The previous prime is 2556790877. The next prime is 2556790889. The reversal of 2556790878 is 8780976552.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556790877) 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, 172378 + ... + 186621.

It is an arithmetic number, because the mean of its divisors is an integer number (319869000).

Almost surely, 2^2556790878 is an apocalyptic number.

2556790878 is an abundant number, since it is smaller than the sum of its proper divisors (2561113122).

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

2556790878 is a wasteful number, since it uses less digits than its factorization.

2556790878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360191.

The product of its (nonzero) digits is 8467200, while the sum is 57.

The square root of 2556790878 is about 50564.7196966422. The cubic root of 2556790878 is about 1367.4089015066.

The spelling of 2556790878 in words is "two billion, five hundred fifty-six million, seven hundred ninety thousand, eight hundred seventy-eight".