25644634 has 4 divisors (see below), whose sum is σ = 38466954. Its totient is φ = 12822316.

The previous prime is 25644629. The next prime is 25644643. The reversal of 25644634 is 43644652.

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

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 11242609 = 3795^2 + 3353^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25644634.

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, 6411157 + ... + 6411160.

Almost surely, 2^25644634 is an apocalyptic number.

25644634 is a deficient number, since it is larger than the sum of its proper divisors (12822320).

25644634 is a wasteful number, since it uses less digits than its factorization.

25644634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12822319.

The product of its digits is 69120, while the sum is 34.

The square root of 25644634 is about 5064.0531197846. The cubic root of 25644634 is about 294.8937048813.

The spelling of 25644634 in words is "twenty-five million, six hundred forty-four thousand, six hundred thirty-four".