25647689 has 2 divisors, whose sum is σ = 25647690. Its totient is φ = 25647688.

The previous prime is 25647659. The next prime is 25647703. The reversal of 25647689 is 98674652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23687689 + 1960000 = 4867^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 25647689 - 2¹² = 25643593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25647619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12823844 + 12823845.

It is an arithmetic number, because the mean of its divisors is an integer number (12823845).

Almost surely, 2^25647689 is an apocalyptic number.

It is an amenable number.

25647689 is a deficient number, since it is larger than the sum of its proper divisors (1).

25647689 is an equidigital number, since it uses as much as digits as its factorization.

25647689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 25647689 is about 5064.3547466583. The cubic root of 25647689 is about 294.9054144719.

The spelling of 25647689 in words is "twenty-five million, six hundred forty-seven thousand, six hundred eighty-nine".