25195921728 has 112 divisors (see below), whose sum is σ = 67636339200. Its totient is φ = 8276995584.

The previous prime is 25195921721. The next prime is 25195921733. The reversal of 25195921728 is 82712959152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25195921721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4085175 + ... + 4091337.

Almost surely, 2^25195921728 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 25195921728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33818169600).

25195921728 is an abundant number, since it is smaller than the sum of its proper divisors (42440417472).

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

25195921728 is a wasteful number, since it uses less digits than its factorization.

25195921728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6484 (or 6474 counting only the distinct ones).

The product of its digits is 907200, while the sum is 51.

The spelling of 25195921728 in words is "twenty-five billion, one hundred ninety-five million, nine hundred twenty-one thousand, seven hundred twenty-eight".