25811228 has 6 divisors (see below), whose sum is σ = 45169656. Its totient is φ = 12905612.

The previous prime is 25811209. The next prime is 25811231. The reversal of 25811228 is 82211852.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 25811228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3226400 + ... + 3226407.

It is an arithmetic number, because the mean of its divisors is an integer number (7528276).

Almost surely, 2^25811228 is an apocalyptic number.

It is an amenable number.

25811228 is a deficient number, since it is larger than the sum of its proper divisors (19358428).

25811228 is a wasteful number, since it uses less digits than its factorization.

25811228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452811 (or 6452809 counting only the distinct ones).

The product of its digits is 2560, while the sum is 29.

The square root of 25811228 is about 5080.4751746269. The cubic root of 25811228 is about 295.5308950055.

The spelling of 25811228 in words is "twenty-five million, eight hundred eleven thousand, two hundred twenty-eight".