25988669 has 12 divisors (see below), whose sum is σ = 31275900. Its totient is φ = 21506688.

The previous prime is 25988663. The next prime is 25988687. The reversal of 25988669 is 96688952.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21279769 + 4708900 = 4613^2 + 2170^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25988669 is a prime.

It is a super-2 number, since 2×25988669² = 1350821832783122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

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 25988669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25988663) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7724 + ... + 10565.

It is an arithmetic number, because the mean of its divisors is an integer number (2606325).

Almost surely, 2^25988669 is an apocalyptic number.

25988669 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

25988669 is a deficient number, since it is larger than the sum of its proper divisors (5287231).

25988669 is a wasteful number, since it uses less digits than its factorization.

25988669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18332 (or 18325 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 53.

The square root of 25988669 is about 5097.9082965467. The cubic root of 25988669 is about 296.2065646349.

The spelling of 25988669 in words is "twenty-five million, nine hundred eighty-eight thousand, six hundred sixty-nine".