25789789 has 2 divisors, whose sum is σ = 25789790. Its totient is φ = 25789788.

The previous prime is 25789769. The next prime is 25789823. The reversal of 25789789 is 98798752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24176889 + 1612900 = 4917^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 25789789 - 2¹⁵ = 25757021 is a prime.

It is a super-2 number, since 2×25789789² = 1330226433329042, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25789769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12894894 + 12894895.

It is an arithmetic number, because the mean of its divisors is an integer number (12894895).

Almost surely, 2^25789789 is an apocalyptic number.

It is an amenable number.

25789789 is a deficient number, since it is larger than the sum of its proper divisors (1).

25789789 is an equidigital number, since it uses as much as digits as its factorization.

25789789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 55.

The square root of 25789789 is about 5078.3647958767. The cubic root of 25789789 is about 295.4490489463.

The spelling of 25789789 in words is "twenty-five million, seven hundred eighty-nine thousand, seven hundred eighty-nine".