25528489 has 4 divisors (see below), whose sum is σ = 29175424. Its totient is φ = 21881556.

The previous prime is 25528463. The next prime is 25528499. The reversal of 25528489 is 98482552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25528489 - 2⁷ = 25528361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25528429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1823457 + ... + 1823470.

It is an arithmetic number, because the mean of its divisors is an integer number (7293856).

Almost surely, 2^25528489 is an apocalyptic number.

It is an amenable number.

25528489 is a deficient number, since it is larger than the sum of its proper divisors (3646935).

25528489 is an equidigital number, since it uses as much as digits as its factorization.

25528489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646934.

The product of its digits is 230400, while the sum is 43.

The square root of 25528489 is about 5052.5725130868. The cubic root of 25528489 is about 294.4478381582.

The spelling of 25528489 in words is "twenty-five million, five hundred twenty-eight thousand, four hundred eighty-nine".