25613643 has 24 divisors (see below), whose sum is σ = 38476368. Its totient is φ = 15136000.

The previous prime is 25613639. The next prime is 25613659. The reversal of 25613643 is 34631652.

It is not a de Polignac number, because 25613643 - 2² = 25613639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25613643.

It is not an unprimeable number, because it can be changed into a prime (25613603) 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 23 ways as a sum of consecutive naturals, for example, 14023 + ... + 15743.

It is an arithmetic number, because the mean of its divisors is an integer number (1603182).

Almost surely, 2^25613643 is an apocalyptic number.

25613643 is a deficient number, since it is larger than the sum of its proper divisors (12862725).

25613643 is a wasteful number, since it uses less digits than its factorization.

25613643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787 (or 1776 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 25613643 is about 5060.9922940072. The cubic root of 25613643 is about 294.7748660535.

Subtracting 25613643 from its reverse (34631652), we obtain a square (9018009 = 3003²).

The spelling of 25613643 in words is "twenty-five million, six hundred thirteen thousand, six hundred forty-three".