28172164684 has 6 divisors (see below), whose sum is σ = 49301288204. Its totient is φ = 14086082340.

The previous prime is 28172164679. The next prime is 28172164723. The reversal of 28172164684 is 48646127182.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3521520582 + ... + 3521520589.

Almost surely, 2^28172164684 is an apocalyptic number.

It is an amenable number.

28172164684 is a deficient number, since it is larger than the sum of its proper divisors (21129123520).

28172164684 is a wasteful number, since it uses less digits than its factorization.

28172164684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043041175 (or 7043041173 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 49.

The spelling of 28172164684 in words is "twenty-eight billion, one hundred seventy-two million, one hundred sixty-four thousand, six hundred eighty-four".