25290565 has 4 divisors (see below), whose sum is σ = 30348684. Its totient is φ = 20232448.

The previous prime is 25290553. The next prime is 25290569. The reversal of 25290565 is 56509252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17623204 + 7667361 = 4198^2 + 2769^2 .

It is a cyclic number.

It is not a de Polignac number, because 25290565 - 2⁷ = 25290437 is a prime.

It is a super-3 number, since 3×25290565³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25290565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25290569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2529052 + ... + 2529061.

It is an arithmetic number, because the mean of its divisors is an integer number (7587171).

Almost surely, 2^25290565 is an apocalyptic number.

It is an amenable number.

25290565 is a deficient number, since it is larger than the sum of its proper divisors (5058119).

25290565 is an equidigital number, since it uses as much as digits as its factorization.

25290565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5058118.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 25290565 is about 5028.9725590820. The cubic root of 25290565 is about 293.5302361114.

The spelling of 25290565 in words is "twenty-five million, two hundred ninety thousand, five hundred sixty-five".