28158284857 has 16 divisors (see below), whose sum is σ = 28537896640. Its totient is φ = 27782092800.

The previous prime is 28158284813. The next prime is 28158284897. The reversal of 28158284857 is 75848285182.

It is a cyclic number.

It is not a de Polignac number, because 28158284857 - 2³¹ = 26010801209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28158284897) 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, 13478269 + ... + 13480357.

It is an arithmetic number, because the mean of its divisors is an integer number (1783618540).

Almost surely, 2^28158284857 is an apocalyptic number.

It is an amenable number.

28158284857 is a deficient number, since it is larger than the sum of its proper divisors (379611783).

28158284857 is a wasteful number, since it uses less digits than its factorization.

28158284857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824.

The product of its digits is 11468800, while the sum is 58.

The spelling of 28158284857 in words is "twenty-eight billion, one hundred fifty-eight million, two hundred eighty-four thousand, eight hundred fifty-seven".