25779965 has 4 divisors (see below), whose sum is σ = 30935964. Its totient is φ = 20623968.

The previous prime is 25779961. The next prime is 25779977. The reversal of 25779965 is 56997752.

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 5331481 + 20448484 = 2309^2 + 4522^2 .

It is a cyclic number.

It is not a de Polignac number, because 25779965 - 2² = 25779961 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25779961) 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, 2577992 + ... + 2578001.

It is an arithmetic number, because the mean of its divisors is an integer number (7733991).

Almost surely, 2^25779965 is an apocalyptic number.

It is an amenable number.

25779965 is a deficient number, since it is larger than the sum of its proper divisors (5155999).

25779965 is an equidigital number, since it uses as much as digits as its factorization.

25779965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155998.

The product of its digits is 1190700, while the sum is 50.

The square root of 25779965 is about 5077.3974632680. The cubic root of 25779965 is about 295.4115294449.

The spelling of 25779965 in words is "twenty-five million, seven hundred seventy-nine thousand, nine hundred sixty-five".