2564776580 has 12 divisors (see below), whose sum is σ = 5386030860. Its totient is φ = 1025910624.

The previous prime is 2564776573. The next prime is 2564776597. The reversal of 2564776580 is 856774652.

It can be written as a sum of positive squares in 2 ways, for example, as 745071616 + 1819704964 = 27296^2 + 42658^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64119395 + ... + 64119434.

It is an arithmetic number, because the mean of its divisors is an integer number (448835905).

Almost surely, 2^2564776580 is an apocalyptic number.

2564776580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2564776580 is an abundant number, since it is smaller than the sum of its proper divisors (2821254280).

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

2564776580 is a wasteful number, since it uses less digits than its factorization.

2564776580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128238838 (or 128238836 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 50.

The square root of 2564776580 is about 50643.6232905980. The cubic root of 2564776580 is about 1368.8310450681.

The spelling of 2564776580 in words is "two billion, five hundred sixty-four million, seven hundred seventy-six thousand, five hundred eighty".