25728989 has 8 divisors (see below), whose sum is σ = 30227232. Its totient is φ = 21590640.

The previous prime is 25728971. The next prime is 25728991. The reversal of 25728989 is 98982752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25728989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25728289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89819 + ... + 90104.

It is an arithmetic number, because the mean of its divisors is an integer number (3778404).

Almost surely, 2^25728989 is an apocalyptic number.

It is an amenable number.

25728989 is a deficient number, since it is larger than the sum of its proper divisors (4498243).

25728989 is a wasteful number, since it uses less digits than its factorization.

25728989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179947.

The product of its digits is 725760, while the sum is 50.

The square root of 25728989 is about 5072.3750847113. The cubic root of 25728989 is about 295.2166903568.

The spelling of 25728989 in words is "twenty-five million, seven hundred twenty-eight thousand, nine hundred eighty-nine".