25647261 has 16 divisors (see below), whose sum is σ = 35493888. Its totient is φ = 16455600.

The previous prime is 25647229. The next prime is 25647287. The reversal of 25647261 is 16274652.

25647261 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 25647261 - 2⁵ = 25647229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25647161) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 18970 + ... + 20276.

It is an arithmetic number, because the mean of its divisors is an integer number (2218368).

Almost surely, 2^25647261 is an apocalyptic number.

It is an amenable number.

25647261 is a deficient number, since it is larger than the sum of its proper divisors (9846627).

25647261 is a wasteful number, since it uses less digits than its factorization.

25647261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552.

The product of its digits is 20160, while the sum is 33.

The square root of 25647261 is about 5064.3124903584. The cubic root of 25647261 is about 294.9037740354.

The spelling of 25647261 in words is "twenty-five million, six hundred forty-seven thousand, two hundred sixty-one".