25728115257 has 12 divisors (see below), whose sum is σ = 40021512804. Its totient is φ = 15832686240.

The previous prime is 25728115207. The next prime is 25728115331. The reversal of 25728115257 is 75251182752.

It can be written as a sum of positive squares in 2 ways, for example, as 4699925136 + 21028190121 = 68556^2 + 145011^2 .

It is not a de Polignac number, because 25728115257 - 2⁸ = 25728115001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25728115207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109949094 + ... + 109949327.

It is an arithmetic number, because the mean of its divisors is an integer number (3335126067).

Almost surely, 2^25728115257 is an apocalyptic number.

It is an amenable number.

25728115257 is a deficient number, since it is larger than the sum of its proper divisors (14293397547).

25728115257 is a wasteful number, since it uses less digits than its factorization.

25728115257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219898440 (or 219898437 counting only the distinct ones).

The product of its digits is 392000, while the sum is 45.

The spelling of 25728115257 in words is "twenty-five billion, seven hundred twenty-eight million, one hundred fifteen thousand, two hundred fifty-seven".