25633621 has 8 divisors (see below), whose sum is σ = 28496384. Its totient is φ = 22898160.

The previous prime is 25633607. The next prime is 25633631. The reversal of 25633621 is 12633652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25633621 - 2⁵ = 25633589 is a prime.

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 25633621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25633631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31401 + ... + 32206.

It is an arithmetic number, because the mean of its divisors is an integer number (3562048).

Almost surely, 2^25633621 is an apocalyptic number.

It is an amenable number.

25633621 is a deficient number, since it is larger than the sum of its proper divisors (2862763).

25633621 is a wasteful number, since it uses less digits than its factorization.

25633621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63651.

The product of its digits is 6480, while the sum is 28.

The square root of 25633621 is about 5062.9656329073. The cubic root of 25633621 is about 294.8514851408.

The spelling of 25633621 in words is "twenty-five million, six hundred thirty-three thousand, six hundred twenty-one".