25728724992 has 78 divisors (see below), whose sum is σ = 68649000348. Its totient is φ = 8570314752.

The previous prime is 25728724979. The next prime is 25728724993. The reversal of 25728724992 is 29942782752.

It is not an unprimeable number, because it can be changed into a prime (25728724993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17780013 + ... + 17781459.

Almost surely, 2^25728724992 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 25728724992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34324500174).

25728724992 is an abundant number, since it is smaller than the sum of its proper divisors (42920275356).

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

25728724992 is an frugal number, since it uses more digits than its factorization.

25728724992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921 (or 1452 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 57.

The spelling of 25728724992 in words is "twenty-five billion, seven hundred twenty-eight million, seven hundred twenty-four thousand, nine hundred ninety-two".