2556785620 has 24 divisors (see below), whose sum is σ = 5371101288. Its totient is φ = 1022361600.

The previous prime is 2556785611. The next prime is 2556785689. The reversal of 2556785620 is 265876552.

2556785620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 82519056 + 2474266564 = 9084^2 + 49742^2 .

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, 41940 + ... + 82900.

It is an arithmetic number, because the mean of its divisors is an integer number (223795887).

Almost surely, 2^2556785620 is an apocalyptic number.

2556785620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2556785620 is an abundant number, since it is smaller than the sum of its proper divisors (2814315668).

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

2556785620 is a wasteful number, since it uses less digits than its factorization.

2556785620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44091 (or 44089 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 46.

The square root of 2556785620 is about 50564.6677038424. The cubic root of 2556785620 is about 1367.4079641544.

The spelling of 2556785620 in words is "two billion, five hundred fifty-six million, seven hundred eighty-five thousand, six hundred twenty".