25806817828 has 48 divisors (see below), whose sum is σ = 50706673920. Its totient is φ = 11392522400.

The previous prime is 25806817793. The next prime is 25806817837. The reversal of 25806817828 is 82871860852.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155583 + ... + 275353.

It is an arithmetic number, because the mean of its divisors is an integer number (1056389040).

Almost surely, 2^25806817828 is an apocalyptic number.

It is an amenable number.

25806817828 is a deficient number, since it is larger than the sum of its proper divisors (24899856092).

25806817828 is a wasteful number, since it uses less digits than its factorization.

25806817828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119928 (or 119926 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 55.

The spelling of 25806817828 in words is "twenty-five billion, eight hundred six million, eight hundred seventeen thousand, eight hundred twenty-eight".