28168721294 has 8 divisors (see below), whose sum is σ = 48289236528. Its totient is φ = 12072309120.

The previous prime is 28168721261. The next prime is 28168721297. The reversal of 28168721294 is 49212786182.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168721297) 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, 1006025747 + ... + 1006025774.

It is an arithmetic number, because the mean of its divisors is an integer number (6036154566).

Almost surely, 2^28168721294 is an apocalyptic number.

28168721294 is a deficient number, since it is larger than the sum of its proper divisors (20120515234).

28168721294 is a wasteful number, since it uses less digits than its factorization.

28168721294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012051530.

The product of its digits is 774144, while the sum is 50.

The spelling of 28168721294 in words is "twenty-eight billion, one hundred sixty-eight million, seven hundred twenty-one thousand, two hundred ninety-four".