2561570 has 48 divisors (see below), whose sum is σ = 5314680. Its totient is φ = 887040.

The previous prime is 2561551. The next prime is 2561593. The reversal of 2561570 is 751652.

It can be written as a sum of positive squares in 4 ways, for example, as 2140369 + 421201 = 1463^2 + 649^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35054 + ... + 35126.

2^2561570 is an apocalyptic number.

2561570 is an abundant number, since it is smaller than the sum of its proper divisors (2753110).

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

2561570 is a wasteful number, since it uses less digits than its factorization.

2561570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 2561570 is about 1600.4905498003. The cubic root of 2561570 is about 136.8260352509.

The spelling of 2561570 in words is "two million, five hundred sixty-one thousand, five hundred seventy".