28157884163 has 4 divisors (see below), whose sum is σ = 28158231360. Its totient is φ = 28157536968.

The previous prime is 28157884147. The next prime is 28157884171. The reversal of 28157884163 is 36148875182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28157884163 - 2⁴ = 28157884147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28157884103) 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, 20081 + ... + 238157.

It is an arithmetic number, because the mean of its divisors is an integer number (7039557840).

Almost surely, 2^28157884163 is an apocalyptic number.

28157884163 is a deficient number, since it is larger than the sum of its proper divisors (347197).

28157884163 is a wasteful number, since it uses less digits than its factorization.

28157884163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347196.

The product of its digits is 2580480, while the sum is 53.

The spelling of 28157884163 in words is "twenty-eight billion, one hundred fifty-seven million, eight hundred eighty-four thousand, one hundred sixty-three".