25764642728 has 16 divisors (see below), whose sum is σ = 52700405760. Its totient is φ = 11711201200.

The previous prime is 25764642727. The next prime is 25764642731. The reversal of 25764642728 is 82724646752.

It is a self number, because there is not a number n which added to its sum of digits gives 25764642728.

It is not an unprimeable number, because it can be changed into a prime (25764642727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146389928 + ... + 146390103.

It is an arithmetic number, because the mean of its divisors is an integer number (3293775360).

Almost surely, 2^25764642728 is an apocalyptic number.

It is an amenable number.

25764642728 is an abundant number, since it is smaller than the sum of its proper divisors (26935763032).

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

25764642728 is a wasteful number, since it uses less digits than its factorization.

25764642728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292780048 (or 292780044 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 53.

The spelling of 25764642728 in words is "twenty-five billion, seven hundred sixty-four million, six hundred forty-two thousand, seven hundred twenty-eight".