25728917 has 2 divisors, whose sum is σ = 25728918. Its totient is φ = 25728916.

The previous prime is 25728889. The next prime is 25728971. The reversal of 25728917 is 71982752.

Together with next prime (25728971) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15062161 + 10666756 = 3881^2 + 3266^2 .

It is a cyclic number.

It is not a de Polignac number, because 25728917 - 2¹⁰ = 25727893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25728617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12864458 + 12864459.

It is an arithmetic number, because the mean of its divisors is an integer number (12864459).

Almost surely, 2^25728917 is an apocalyptic number.

It is an amenable number.

25728917 is a deficient number, since it is larger than the sum of its proper divisors (1).

25728917 is an equidigital number, since it uses as much as digits as its factorization.

25728917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 25728917 is about 5072.3679874394. The cubic root of 25728917 is about 295.2164149784.

The spelling of 25728917 in words is "twenty-five million, seven hundred twenty-eight thousand, nine hundred seventeen".