25989669 has 6 divisors (see below), whose sum is σ = 37540646. Its totient is φ = 17326440.

The previous prime is 25989659. The next prime is 25989671. The reversal of 25989669 is 96698952.

It can be written as a sum of positive squares in only one way, i.e., 23648769 + 2340900 = 4863^2 + 1530^2 .

It is not a de Polignac number, because 25989669 - 2⁴ = 25989653 is a prime.

It is a super-2 number, since 2×25989669² = 1350925789459122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25989629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1443862 + ... + 1443879.

Almost surely, 2^25989669 is an apocalyptic number.

It is an amenable number.

25989669 is a deficient number, since it is larger than the sum of its proper divisors (11550977).

25989669 is a wasteful number, since it uses less digits than its factorization.

25989669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887747 (or 2887744 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 25989669 is about 5098.0063750451. The cubic root of 25989669 is about 296.2103637620.

The spelling of 25989669 in words is "twenty-five million, nine hundred eighty-nine thousand, six hundred sixty-nine".