25647287 has 2 divisors, whose sum is σ = 25647288. Its totient is φ = 25647286.

The previous prime is 25647229. The next prime is 25647317. The reversal of 25647287 is 78274652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25647287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25677287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12823643 + 12823644.

It is an arithmetic number, because the mean of its divisors is an integer number (12823644).

Almost surely, 2^25647287 is an apocalyptic number.

25647287 is a deficient number, since it is larger than the sum of its proper divisors (1).

25647287 is an equidigital number, since it uses as much as digits as its factorization.

25647287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 41.

The square root of 25647287 is about 5064.3150573399. The cubic root of 25647287 is about 294.9038736886.

The spelling of 25647287 in words is "twenty-five million, six hundred forty-seven thousand, two hundred eighty-seven".