25728857 has 16 divisors (see below), whose sum is σ = 32372352. Its totient is φ = 19864320.

The previous prime is 25728851. The next prime is 25728863. The reversal of 25728857 is 75882752.

It is an interprime number because it is at equal distance from previous prime (25728851) and next prime (25728863).

It is not a de Polignac number, because 25728857 - 2¹⁶ = 25663321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25728851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7223 + ... + 10179.

It is an arithmetic number, because the mean of its divisors is an integer number (2023272).

Almost surely, 2^25728857 is an apocalyptic number.

It is an amenable number.

25728857 is a deficient number, since it is larger than the sum of its proper divisors (6643495).

25728857 is a wasteful number, since it uses less digits than its factorization.

25728857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088.

The product of its digits is 313600, while the sum is 44.

The square root of 25728857 is about 5072.3620730386. The cubic root of 25728857 is about 295.2161854961.

The spelling of 25728857 in words is "twenty-five million, seven hundred twenty-eight thousand, eight hundred fifty-seven".