25643425 has 12 divisors (see below), whose sum is σ = 32247936. Its totient is φ = 20224400.

The previous prime is 25643419. The next prime is 25643441. The reversal of 25643425 is 52434652.

It is not a de Polignac number, because 25643425 - 2⁷ = 25643297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5449 + ... + 8998.

It is an arithmetic number, because the mean of its divisors is an integer number (2687328).

Almost surely, 2^25643425 is an apocalyptic number.

25643425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25643425 is a deficient number, since it is larger than the sum of its proper divisors (6604511).

25643425 is a wasteful number, since it uses less digits than its factorization.

25643425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14528 (or 14523 counting only the distinct ones).

The product of its digits is 28800, while the sum is 31.

The square root of 25643425 is about 5063.9337475919. The cubic root of 25643425 is about 294.8890706163.

It can be divided in two parts, 256 and 43425, that added together give a square (43681 = 209²).

The spelling of 25643425 in words is "twenty-five million, six hundred forty-three thousand, four hundred twenty-five".