25720684728 has 64 divisors (see below), whose sum is σ = 64704096000. Its totient is φ = 8520019200.

The previous prime is 25720684721. The next prime is 25720684729. The reversal of 25720684728 is 82748602752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25720684721) 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, 4548703 + ... + 4554353.

It is an arithmetic number, because the mean of its divisors is an integer number (1011001500).

Almost surely, 2^25720684728 is an apocalyptic number.

It is an amenable number.

25720684728 is an abundant number, since it is smaller than the sum of its proper divisors (38983411272).

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

25720684728 is a wasteful number, since it uses less digits than its factorization.

25720684728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6812 (or 6808 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 51.

The spelling of 25720684728 in words is "twenty-five billion, seven hundred twenty million, six hundred eighty-four thousand, seven hundred twenty-eight".