2565870 has 48 divisors (see below), whose sum is σ = 6434640. Its totient is φ = 654720.

The previous prime is 2565863. The next prime is 2565881. The reversal of 2565870 is 785652.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28786 + ... + 28874.

It is an arithmetic number, because the mean of its divisors is an integer number (134055).

2^2565870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2565870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3217320).

2565870 is an abundant number, since it is smaller than the sum of its proper divisors (3868770).

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

2565870 is a wasteful number, since it uses less digits than its factorization.

2565870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 2565870 is about 1601.8333246627. The cubic root of 2565870 is about 136.9025538240.

The spelling of 2565870 in words is "two million, five hundred sixty-five thousand, eight hundred seventy".