2565312780 has 48 divisors (see below), whose sum is σ = 7186888800. Its totient is φ = 683701248.

The previous prime is 2565312773. The next prime is 2565312803. The reversal of 2565312780 is 872135652.

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, 105972 + ... + 127908.

It is an arithmetic number, because the mean of its divisors is an integer number (149726850).

Almost surely, 2^2565312780 is an apocalyptic number.

2565312780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2565312780 is an abundant number, since it is smaller than the sum of its proper divisors (4621576020).

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

2565312780 is a wasteful number, since it uses less digits than its factorization.

2565312780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23898 (or 23896 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 2565312780 is about 50648.9168689716. The cubic root of 2565312780 is about 1368.9264290831.

The spelling of 2565312780 in words is "two billion, five hundred sixty-five million, three hundred twelve thousand, seven hundred eighty".