25779474928 has 40 divisors (see below), whose sum is σ = 52200908928. Its totient is φ = 12310026432.

The previous prime is 25779474913. The next prime is 25779474947. The reversal of 25779474928 is 82947497752.

It is a self number, because there is not a number n which added to its sum of digits gives 25779474928.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 182151 + ... + 291097.

Almost surely, 2^25779474928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25779474928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26100454464).

25779474928 is an abundant number, since it is smaller than the sum of its proper divisors (26421434000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25779474928 is a wasteful number, since it uses less digits than its factorization.

25779474928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109621 (or 109615 counting only the distinct ones).

The product of its digits is 71124480, while the sum is 64.

The spelling of 25779474928 in words is "twenty-five billion, seven hundred seventy-nine million, four hundred seventy-four thousand, nine hundred twenty-eight".