2565278988 has 48 divisors (see below), whose sum is σ = 6472617984. Its totient is φ = 787667200.

The previous prime is 2565278929. The next prime is 2565279019. The reversal of 2565278988 is 8898725652.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124188 + ... + 143363.

It is an arithmetic number, because the mean of its divisors is an integer number (134846208).

Almost surely, 2^2565278988 is an apocalyptic number.

It is an amenable number.

2565278988 is an abundant number, since it is smaller than the sum of its proper divisors (3907338996).

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

2565278988 is a wasteful number, since it uses less digits than its factorization.

2565278988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267622 (or 267620 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 60.

The square root of 2565278988 is about 50648.5832773238. The cubic root of 2565278988 is about 1368.9204182547.

The spelling of 2565278988 in words is "two billion, five hundred sixty-five million, two hundred seventy-eight thousand, nine hundred eighty-eight".