25828281 has 16 divisors (see below), whose sum is σ = 38352000. Its totient is φ = 17179344.

The previous prime is 25828279. The next prime is 25828289. The reversal of 25828281 is 18282852.

It is a happy number.

It is not a de Polignac number, because 25828281 - 2¹ = 25828279 is a prime.

It is a super-2 number, since 2×25828281² = 1334200198829922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25828289) 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 15 ways as a sum of consecutive naturals, for example, 15375 + ... + 16971.

It is an arithmetic number, because the mean of its divisors is an integer number (2397000).

Almost surely, 2^25828281 is an apocalyptic number.

It is an amenable number.

25828281 is a deficient number, since it is larger than the sum of its proper divisors (12523719).

25828281 is a wasteful number, since it uses less digits than its factorization.

25828281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205 (or 2199 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 25828281 is about 5082.1531854127. The cubic root of 25828281 is about 295.5959646060.

The spelling of 25828281 in words is "twenty-five million, eight hundred twenty-eight thousand, two hundred eighty-one".