25644742 has 4 divisors (see below), whose sum is σ = 38467116. Its totient is φ = 12822370.

The previous prime is 25644733. The next prime is 25644761. The reversal of 25644742 is 24744652.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 25644698 and 25644707.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6411184 + ... + 6411187.

It is an arithmetic number, because the mean of its divisors is an integer number (9616779).

Almost surely, 2^25644742 is an apocalyptic number.

25644742 is a deficient number, since it is larger than the sum of its proper divisors (12822374).

25644742 is a wasteful number, since it uses less digits than its factorization.

25644742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12822373.

The product of its digits is 53760, while the sum is 34.

The square root of 25644742 is about 5064.0637831686. The cubic root of 25644742 is about 294.8941188533.

The spelling of 25644742 in words is "twenty-five million, six hundred forty-four thousand, seven hundred forty-two".