25726289 has 4 divisors (see below), whose sum is σ = 25962420. Its totient is φ = 25490160.

The previous prime is 25726273. The next prime is 25726303. The reversal of 25726289 is 98262752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8850625 + 16875664 = 2975^2 + 4108^2 .

It is a cyclic number.

It is not a de Polignac number, because 25726289 - 2⁴ = 25726273 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25726189) 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, 117902 + ... + 118119.

It is an arithmetic number, because the mean of its divisors is an integer number (6490605).

Almost surely, 2^25726289 is an apocalyptic number.

It is an amenable number.

25726289 is a deficient number, since it is larger than the sum of its proper divisors (236131).

25726289 is a wasteful number, since it uses less digits than its factorization.

25726289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236130.

The product of its digits is 120960, while the sum is 41.

The square root of 25726289 is about 5072.1089302183. The cubic root of 25726289 is about 295.2063633161.

The spelling of 25726289 in words is "twenty-five million, seven hundred twenty-six thousand, two hundred eighty-nine".