25280789 has 2 divisors, whose sum is σ = 25280790. Its totient is φ = 25280788.

The previous prime is 25280767. The next prime is 25280791. The reversal of 25280789 is 98708252.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24900100 + 380689 = 4990^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 25280789 - 2⁸ = 25280533 is a prime.

It is a Sophie Germain prime.

Together with 25280791, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25283789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12640394 + 12640395.

It is an arithmetic number, because the mean of its divisors is an integer number (12640395).

Almost surely, 2^25280789 is an apocalyptic number.

It is an amenable number.

25280789 is a deficient number, since it is larger than the sum of its proper divisors (1).

25280789 is an equidigital number, since it uses as much as digits as its factorization.

25280789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 25280789 is about 5028.0004972156. Note that the first 3 decimals coincide. The cubic root of 25280789 is about 293.4924101289.

The spelling of 25280789 in words is "twenty-five million, two hundred eighty thousand, seven hundred eighty-nine".