28173863686 has 8 divisors (see below), whose sum is σ = 42264669384. Its totient is φ = 14085640560.

The previous prime is 28173863681. The next prime is 28173863737. The reversal of 28173863686 is 68636837182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28173863686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173863681) 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, 618135 + ... + 662146.

It is an arithmetic number, because the mean of its divisors is an integer number (5283083673).

Almost surely, 2^28173863686 is an apocalyptic number.

28173863686 is a deficient number, since it is larger than the sum of its proper divisors (14090805698).

28173863686 is a wasteful number, since it uses less digits than its factorization.

28173863686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291286.

The product of its digits is 13934592, while the sum is 58.

The spelling of 28173863686 in words is "twenty-eight billion, one hundred seventy-three million, eight hundred sixty-three thousand, six hundred eighty-six".