25728458891 has 2 divisors, whose sum is σ = 25728458892. Its totient is φ = 25728458890.

The previous prime is 25728458851. The next prime is 25728458911. The reversal of 25728458891 is 19885482752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25728458891 - 2⁶ = 25728458827 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25728458891.

It is not a weakly prime, because it can be changed into another prime (25728458831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12864229445 + 12864229446.

It is an arithmetic number, because the mean of its divisors is an integer number (12864229446).

Almost surely, 2^25728458891 is an apocalyptic number.

25728458891 is a deficient number, since it is larger than the sum of its proper divisors (1).

25728458891 is an equidigital number, since it uses as much as digits as its factorization.

25728458891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12902400, while the sum is 59.

The spelling of 25728458891 in words is "twenty-five billion, seven hundred twenty-eight million, four hundred fifty-eight thousand, eight hundred ninety-one".