25506789 has 16 divisors (see below), whose sum is σ = 42401280. Its totient is φ = 13250160.

The previous prime is 25506781. The next prime is 25506823. The reversal of 25506789 is 98760552.

It is not a de Polignac number, because 25506789 - 2³ = 25506781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25506789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25506781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54979 + ... + 55440.

It is an arithmetic number, because the mean of its divisors is an integer number (2650080).

Almost surely, 2^25506789 is an apocalyptic number.

It is an amenable number.

25506789 is a deficient number, since it is larger than the sum of its proper divisors (16894491).

25506789 is a wasteful number, since it uses less digits than its factorization.

25506789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110440.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 25506789 is about 5050.4246356123. The cubic root of 25506789 is about 294.3643846047.

It can be divided in two parts, 2550 and 6789, that added together give a palindrome (9339).

The spelling of 25506789 in words is "twenty-five million, five hundred six thousand, seven hundred eighty-nine".