2561978080 has 24 divisors (see below), whose sum is σ = 6052673592. Its totient is φ = 1024791168.

The previous prime is 2561978053. The next prime is 2561978123. The reversal of 2561978080 is 808791652.

It is a self number, because there is not a number n which added to its sum of digits gives 2561978080.

It is a congruent number.

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, 8006022 + ... + 8006341.

It is an arithmetic number, because the mean of its divisors is an integer number (252194733).

Almost surely, 2^2561978080 is an apocalyptic number.

2561978080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561978080 is an abundant number, since it is smaller than the sum of its proper divisors (3490695512).

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

2561978080 is a wasteful number, since it uses less digits than its factorization.

2561978080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16012378 (or 16012370 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 2561978080 is about 50615.9864074583. The cubic root of 2561978080 is about 1368.3330071744. Note that the first 3 decimals are identical.

The spelling of 2561978080 in words is "two billion, five hundred sixty-one million, nine hundred seventy-eight thousand, eighty".