25684457 has 2 divisors, whose sum is σ = 25684458. Its totient is φ = 25684456.

The previous prime is 25684453. The next prime is 25684481. The reversal of 25684457 is 75448652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13039321 + 12645136 = 3611^2 + 3556^2 .

It is a cyclic number.

It is not a de Polignac number, because 25684457 - 2² = 25684453 is a prime.

It is not a weakly prime, because it can be changed into another prime (25684453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12842228 + 12842229.

It is an arithmetic number, because the mean of its divisors is an integer number (12842229).

Almost surely, 2^25684457 is an apocalyptic number.

It is an amenable number.

25684457 is a deficient number, since it is larger than the sum of its proper divisors (1).

25684457 is an equidigital number, since it uses as much as digits as its factorization.

25684457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268800, while the sum is 41.

The square root of 25684457 is about 5067.9835240458. The cubic root of 25684457 is about 295.0462706316.

The spelling of 25684457 in words is "twenty-five million, six hundred eighty-four thousand, four hundred fifty-seven".