25257728 has 18 divisors (see below), whose sum is σ = 50417304. Its totient is φ = 12628736.

The previous prime is 25257719. The next prime is 25257737. The reversal of 25257728 is 82775252.

It is an interprime number because it is at equal distance from previous prime (25257719) and next prime (25257737).

It is a junction number, because it is equal to n+sod(n) for n = 25257691 and 25257700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49076 + ... + 49587.

Almost surely, 2^25257728 is an apocalyptic number.

It is an amenable number.

25257728 is a deficient number, since it is larger than the sum of its proper divisors (25159576).

25257728 is an frugal number, since it uses more digits than its factorization.

25257728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98679 (or 98665 counting only the distinct ones).

The product of its digits is 78400, while the sum is 38.

The square root of 25257728 is about 5025.7067164728. The cubic root of 25257728 is about 293.4031422466.

The spelling of 25257728 in words is "twenty-five million, two hundred fifty-seven thousand, seven hundred twenty-eight".