2561379788 has 18 divisors (see below), whose sum is σ = 4926952548. Its totient is φ = 1164263320.

The previous prime is 2561379787. The next prime is 2561379823. The reversal of 2561379788 is 8879731652.

2561379788 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 (2561379787) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2645570 + ... + 2646537.

It is an arithmetic number, because the mean of its divisors is an integer number (273719586).

Almost surely, 2^2561379788 is an apocalyptic number.

It is an amenable number.

2561379788 is a deficient number, since it is larger than the sum of its proper divisors (2365572760).

2561379788 is a wasteful number, since it uses less digits than its factorization.

2561379788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5292133 (or 5292120 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 56.

The square root of 2561379788 is about 50610.0759533119. The cubic root of 2561379788 is about 1368.2264844797.

The spelling of 2561379788 in words is "two billion, five hundred sixty-one million, three hundred seventy-nine thousand, seven hundred eighty-eight".