25564989 has 8 divisors (see below), whose sum is σ = 34595680. Its totient is φ = 16788816.

The previous prime is 25564963. The next prime is 25564997. The reversal of 25564989 is 98946552.

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

It is not a de Polignac number, because 25564989 - 2⁸ = 25564733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25564939) 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 7 ways as a sum of consecutive naturals, for example, 63394 + ... + 63795.

It is an arithmetic number, because the mean of its divisors is an integer number (4324460).

Almost surely, 2^25564989 is an apocalyptic number.

It is an amenable number.

25564989 is a deficient number, since it is larger than the sum of its proper divisors (9030691).

25564989 is a wasteful number, since it uses less digits than its factorization.

25564989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127259.

The product of its digits is 777600, while the sum is 48.

The square root of 25564989 is about 5056.1832443059. The cubic root of 25564989 is about 294.5881027343.

The spelling of 25564989 in words is "twenty-five million, five hundred sixty-four thousand, nine hundred eighty-nine".