25716257 has 8 divisors (see below), whose sum is σ = 31118976. Its totient is φ = 20745792.

The previous prime is 25716241. The next prime is 25716259. The reversal of 25716257 is 75261752.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25716257 - 2⁴ = 25716241 is a prime.

It is a super-2 number, since 2×25716257² = 1322651748180098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25716259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107933 + ... + 108170.

It is an arithmetic number, because the mean of its divisors is an integer number (3889872).

Almost surely, 2^25716257 is an apocalyptic number.

It is an amenable number.

25716257 is a deficient number, since it is larger than the sum of its proper divisors (5402719).

25716257 is a wasteful number, since it uses less digits than its factorization.

25716257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216127.

The product of its digits is 29400, while the sum is 35.

The square root of 25716257 is about 5071.1198960387. The cubic root of 25716257 is about 295.1679862917.

The spelling of 25716257 in words is "twenty-five million, seven hundred sixteen thousand, two hundred fifty-seven".