25720789 has 2 divisors, whose sum is σ = 25720790. Its totient is φ = 25720788.

The previous prime is 25720781. The next prime is 25720801. The reversal of 25720789 is 98702752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25654225 + 66564 = 5065^2 + 258^2 .

It is a cyclic number.

It is not a de Polignac number, because 25720789 - 2³ = 25720781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25720781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860394 + 12860395.

It is an arithmetic number, because the mean of its divisors is an integer number (12860395).

Almost surely, 2^25720789 is an apocalyptic number.

It is an amenable number.

25720789 is a deficient number, since it is larger than the sum of its proper divisors (1).

25720789 is an equidigital number, since it uses as much as digits as its factorization.

25720789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 25720789 is about 5071.5667204524. The cubic root of 25720789 is about 295.1853245165.

The spelling of 25720789 in words is "twenty-five million, seven hundred twenty thousand, seven hundred eighty-nine".