28168690028 has 6 divisors (see below), whose sum is σ = 49295207556. Its totient is φ = 14084345012.

The previous prime is 28168690013. The next prime is 28168690037. The reversal of 28168690028 is 82009686182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3521086250 + ... + 3521086257.

It is an arithmetic number, because the mean of its divisors is an integer number (8215867926).

Almost surely, 2^28168690028 is an apocalyptic number.

It is an amenable number.

28168690028 is a deficient number, since it is larger than the sum of its proper divisors (21126517528).

28168690028 is a wasteful number, since it uses less digits than its factorization.

28168690028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042172511 (or 7042172509 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 28168690028 in words is "twenty-eight billion, one hundred sixty-eight million, six hundred ninety thousand, twenty-eight".