2561560 has 32 divisors (see below), whose sum is σ = 6104160. Its totient is φ = 964096.

The previous prime is 2561551. The next prime is 2561593. The reversal of 2561560 is 651652.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1204 + ... + 2563.

It is an arithmetic number, because the mean of its divisors is an integer number (190755).

2^2561560 is an apocalyptic number.

2561560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561560 is an abundant number, since it is smaller than the sum of its proper divisors (3542600).

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

2561560 is a wasteful number, since it uses less digits than its factorization.

2561560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3795 (or 3791 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2561560 is about 1600.4874257550. The cubic root of 2561560 is about 136.8258572009.

The spelling of 2561560 in words is "two million, five hundred sixty-one thousand, five hundred sixty".