25644013 has 4 divisors (see below), whose sum is σ = 25893088. Its totient is φ = 25394940.

The previous prime is 25643957. The next prime is 25644029. The reversal of 25644013 is 31044652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25644013 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 (25644043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124383 + ... + 124588.

It is an arithmetic number, because the mean of its divisors is an integer number (6473272).

Almost surely, 2^25644013 is an apocalyptic number.

It is an amenable number.

25644013 is a deficient number, since it is larger than the sum of its proper divisors (249075).

25644013 is a wasteful number, since it uses less digits than its factorization.

25644013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249074.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 25644013 is about 5063.9918048907. The cubic root of 25644013 is about 294.8913245202.

Adding to 25644013 its reverse (31044652), we get a palindrome (56688665).

The spelling of 25644013 in words is "twenty-five million, six hundred forty-four thousand, thirteen".