25728971 has 2 divisors, whose sum is σ = 25728972. Its totient is φ = 25728970.

The previous prime is 25728917. The next prime is 25728991. The reversal of 25728971 is 17982752.

Together with previous prime (25728917) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25728971 - 2¹⁸ = 25466827 is a prime.

It is not a weakly prime, because it can be changed into another prime (25728991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12864485 + 12864486.

It is an arithmetic number, because the mean of its divisors is an integer number (12864486).

Almost surely, 2^25728971 is an apocalyptic number.

25728971 is a deficient number, since it is larger than the sum of its proper divisors (1).

25728971 is an equidigital number, since it uses as much as digits as its factorization.

25728971 is an odious number, because the sum of its binary digits is odd.

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

The square root of 25728971 is about 5072.3733103943. The cubic root of 25728971 is about 295.2166215123.

The spelling of 25728971 in words is "twenty-five million, seven hundred twenty-eight thousand, nine hundred seventy-one".