25228809 has 6 divisors (see below), whose sum is σ = 36441626. Its totient is φ = 16819200.

The previous prime is 25228787. The next prime is 25228837. The reversal of 25228809 is 90882252.

It can be written as a sum of positive squares in only one way, i.e., 24950025 + 278784 = 4995^2 + 528^2 .

It is not a de Polignac number, because 25228809 - 2⁹ = 25228297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25228849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1401592 + ... + 1401609.

Almost surely, 2^25228809 is an apocalyptic number.

It is an amenable number.

25228809 is a deficient number, since it is larger than the sum of its proper divisors (11212817).

25228809 is a wasteful number, since it uses less digits than its factorization.

25228809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803207 (or 2803204 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 25228809 is about 5022.8287846591. The cubic root of 25228809 is about 293.2911215372.

The spelling of 25228809 in words is "twenty-five million, two hundred twenty-eight thousand, eight hundred nine".