2561436260 has 12 divisors (see below), whose sum is σ = 5379016188. Its totient is φ = 1024574496.

The previous prime is 2561436217. The next prime is 2561436277. The reversal of 2561436260 is 626341652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 311451904 + 2249984356 = 17648^2 + 47434^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2561436260.

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, 64035887 + ... + 64035926.

It is an arithmetic number, because the mean of its divisors is an integer number (448251349).

Almost surely, 2^2561436260 is an apocalyptic number.

2561436260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561436260 is an abundant number, since it is smaller than the sum of its proper divisors (2817579928).

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

2561436260 is a wasteful number, since it uses less digits than its factorization.

2561436260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128071822 (or 128071820 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 2561436260 is about 50610.6338628553. The cubic root of 2561436260 is about 1368.2365397266.

The spelling of 2561436260 in words is "two billion, five hundred sixty-one million, four hundred thirty-six thousand, two hundred sixty".