2565690 has 16 divisors (see below), whose sum is σ = 6157728. Its totient is φ = 684176.

The previous prime is 2565679. The next prime is 2565701. The reversal of 2565690 is 965652.

2565690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2565679) and next prime (2565701).

It is a super-2 number, since 2×2565690² = 13165530352200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42732 + ... + 42791.

It is an arithmetic number, because the mean of its divisors is an integer number (384858).

2^2565690 is an apocalyptic number.

2565690 is an abundant number, since it is smaller than the sum of its proper divisors (3592038).

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

2565690 is a wasteful number, since it uses less digits than its factorization.

2565690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85533.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 2565690 is about 1601.7771380564. Note that the first 3 decimals coincide. The cubic root of 2565690 is about 136.8993524361.

The spelling of 2565690 in words is "two million, five hundred sixty-five thousand, six hundred ninety".