25644641 has 8 divisors (see below), whose sum is σ = 28627104. Its totient is φ = 22770720.

The previous prime is 25644629. The next prime is 25644643. The reversal of 25644641 is 14644652.

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 25644641 - 2²² = 21450337 is a prime.

It is a super-2 number, since 2×25644641² = 1315295224037762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25644598 and 25644607.

It is not an unprimeable number, because it can be changed into a prime (25644643) 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, 26636 + ... + 27581.

It is an arithmetic number, because the mean of its divisors is an integer number (3578388).

Almost surely, 2^25644641 is an apocalyptic number.

It is an amenable number.

25644641 is a deficient number, since it is larger than the sum of its proper divisors (2982463).

25644641 is a wasteful number, since it uses less digits than its factorization.

25644641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54271.

The product of its digits is 23040, while the sum is 32.

The square root of 25644641 is about 5064.0538109305. The cubic root of 25644641 is about 294.8937317129.

The spelling of 25644641 in words is "twenty-five million, six hundred forty-four thousand, six hundred forty-one".