28618556818 has 4 divisors (see below), whose sum is σ = 42927835230. Its totient is φ = 14309278408.

The previous prime is 28618556801. The next prime is 28618556867. The reversal of 28618556818 is 81865581682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17195863689 + 11422693129 = 131133^2 + 106877^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7154639203 + ... + 7154639206.

Almost surely, 2^28618556818 is an apocalyptic number.

28618556818 is a deficient number, since it is larger than the sum of its proper divisors (14309278412).

28618556818 is a wasteful number, since it uses less digits than its factorization.

28618556818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14309278411.

The product of its digits is 7372800, while the sum is 58.

The spelling of 28618556818 in words is "twenty-eight billion, six hundred eighteen million, five hundred fifty-six thousand, eight hundred eighteen".