28125628786 has 8 divisors (see below), whose sum is σ = 43217429724. Its totient is φ = 13719818880.

The previous prime is 28125628781. The next prime is 28125628793. The reversal of 28125628786 is 68782652182.

It can be written as a sum of positive squares in 2 ways, for example, as 27647375625 + 478253161 = 166275^2 + 21869^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28125628781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171497655 + ... + 171497818.

Almost surely, 2^28125628786 is an apocalyptic number.

28125628786 is a deficient number, since it is larger than the sum of its proper divisors (15091800938).

28125628786 is a wasteful number, since it uses less digits than its factorization.

28125628786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342995516.

The product of its digits is 5160960, while the sum is 55.

The spelling of 28125628786 in words is "twenty-eight billion, one hundred twenty-five million, six hundred twenty-eight thousand, seven hundred eighty-six".