28136842499 has 4 divisors (see below), whose sum is σ = 28415425200. Its totient is φ = 27858259800.

The previous prime is 28136842441. The next prime is 28136842523. The reversal of 28136842499 is 99424863182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28136842499 - 2²⁰ = 28135793923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28136842429) 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, 139291199 + ... + 139291400.

It is an arithmetic number, because the mean of its divisors is an integer number (7103856300).

Almost surely, 2^28136842499 is an apocalyptic number.

28136842499 is a deficient number, since it is larger than the sum of its proper divisors (278582701).

28136842499 is a wasteful number, since it uses less digits than its factorization.

28136842499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278582700.

The product of its digits is 5971968, while the sum is 56.

The spelling of 28136842499 in words is "twenty-eight billion, one hundred thirty-six million, eight hundred forty-two thousand, four hundred ninety-nine".