28651642199 has 4 divisors (see below), whose sum is σ = 28919414664. Its totient is φ = 28383869736.

The previous prime is 28651642171. The next prime is 28651642289. The reversal of 28651642199 is 99124615682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28651642199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28651642199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28651642139) 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, 133886072 + ... + 133886285.

It is an arithmetic number, because the mean of its divisors is an integer number (7229853666).

Almost surely, 2^28651642199 is an apocalyptic number.

28651642199 is a deficient number, since it is larger than the sum of its proper divisors (267772465).

28651642199 is a wasteful number, since it uses less digits than its factorization.

28651642199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267772464.

The product of its digits is 1866240, while the sum is 53.

The spelling of 28651642199 in words is "twenty-eight billion, six hundred fifty-one million, six hundred forty-two thousand, one hundred ninety-nine".