25638757 has 2 divisors, whose sum is σ = 25638758. Its totient is φ = 25638756.

The previous prime is 25638751. The next prime is 25638791. The reversal of 25638757 is 75783652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 6155361 = 4414^2 + 2481^2 .

It is a cyclic number.

It is not a de Polignac number, because 25638757 - 2¹⁵ = 25605989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25638751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12819378 + 12819379.

It is an arithmetic number, because the mean of its divisors is an integer number (12819379).

Almost surely, 2^25638757 is an apocalyptic number.

It is an amenable number.

25638757 is a deficient number, since it is larger than the sum of its proper divisors (1).

25638757 is an equidigital number, since it uses as much as digits as its factorization.

25638757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 43.

The square root of 25638757 is about 5063.4728201107. The cubic root of 25638757 is about 294.8711761565.

The spelling of 25638757 in words is "twenty-five million, six hundred thirty-eight thousand, seven hundred fifty-seven".