25612621 has 12 divisors (see below), whose sum is σ = 26896212. Its totient is φ = 24380928.

The previous prime is 25612607. The next prime is 25612633. The reversal of 25612621 is 12621652.

It can be written as a sum of positive squares in 6 ways, for example, as 6375625 + 19236996 = 2525^2 + 4386^2 .

It is not a de Polignac number, because 25612621 - 2⁹ = 25612109 is a prime.

It is a Duffinian number.

Its product of digits (1440) is a multiple of the sum of its prime factors (480).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25612651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72381 + ... + 72733.

It is an arithmetic number, because the mean of its divisors is an integer number (2241351).

Almost surely, 2^25612621 is an apocalyptic number.

It is an amenable number.

25612621 is a deficient number, since it is larger than the sum of its proper divisors (1283591).

25612621 is an equidigital number, since it uses as much as digits as its factorization.

25612621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 443 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 25612621 is about 5060.8913246581. The cubic root of 25612621 is about 294.7709454357.

The spelling of 25612621 in words is "twenty-five million, six hundred twelve thousand, six hundred twenty-one".