25428769 has 2 divisors, whose sum is σ = 25428770. Its totient is φ = 25428768.

The previous prime is 25428763. The next prime is 25428779. The reversal of 25428769 is 96782452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13950225 + 11478544 = 3735^2 + 3388^2 .

It is a cyclic number.

It is not a de Polignac number, because 25428769 - 2¹¹ = 25426721 is a prime.

It is a super-2 number, since 2×25428769² = 1293244585710722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25428763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12714384 + 12714385.

It is an arithmetic number, because the mean of its divisors is an integer number (12714385).

Almost surely, 2^25428769 is an apocalyptic number.

It is an amenable number.

25428769 is a deficient number, since it is larger than the sum of its proper divisors (1).

25428769 is an equidigital number, since it uses as much as digits as its factorization.

25428769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 25428769 is about 5042.6946169682. The cubic root of 25428769 is about 294.0639447811.

It can be divided in two parts, 2542 and 8769, that added together give a palindrome (11311).

The spelling of 25428769 in words is "twenty-five million, four hundred twenty-eight thousand, seven hundred sixty-nine".