25328647 has 4 divisors (see below), whose sum is σ = 25806600. Its totient is φ = 24850696.

The previous prime is 25328621. The next prime is 25328669. The reversal of 25328647 is 74682352.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25328647 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 (25325647) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 238897 + ... + 239002.

It is an arithmetic number, because the mean of its divisors is an integer number (6451650).

Almost surely, 2^25328647 is an apocalyptic number.

25328647 is a deficient number, since it is larger than the sum of its proper divisors (477953).

25328647 is an equidigital number, since it uses as much as digits as its factorization.

25328647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477952.

The product of its digits is 80640, while the sum is 37.

The square root of 25328647 is about 5032.7573953053. The cubic root of 25328647 is about 293.6774927728.

It can be divided in two parts, 253 and 28647, that added together give a square (28900 = 170²).

The spelling of 25328647 in words is "twenty-five million, three hundred twenty-eight thousand, six hundred forty-seven".