25623641 has 12 divisors (see below), whose sum is σ = 27662292. Its totient is φ = 23652864.

The previous prime is 25623613. The next prime is 25623649. The reversal of 25623641 is 14632652.

It can be written as a sum of positive squares in 2 ways, for example, as 10916416 + 14707225 = 3304^2 + 3835^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25623641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25623649) 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, 58961 + ... + 59393.

It is an arithmetic number, because the mean of its divisors is an integer number (2305191).

Almost surely, 2^25623641 is an apocalyptic number.

It is an amenable number.

25623641 is a deficient number, since it is larger than the sum of its proper divisors (2038651).

25623641 is an equidigital number, since it uses as much as digits as its factorization.

25623641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 509 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 25623641 is about 5061.9799485972. The cubic root of 25623641 is about 294.8132150918.

The spelling of 25623641 in words is "twenty-five million, six hundred twenty-three thousand, six hundred forty-one".