28164421868 has 24 divisors (see below), whose sum is σ = 53877991104. Its totient is φ = 12775926800.

The previous prime is 28164421843. The next prime is 28164421891. The reversal of 28164421868 is 86812446182.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630230 + ... + 673437.

It is an arithmetic number, because the mean of its divisors is an integer number (2244916296).

Almost surely, 2^28164421868 is an apocalyptic number.

It is an amenable number.

28164421868 is a deficient number, since it is larger than the sum of its proper divisors (25713569236).

28164421868 is a wasteful number, since it uses less digits than its factorization.

28164421868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304173 (or 1304171 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 50.

The spelling of 28164421868 in words is "twenty-eight billion, one hundred sixty-four million, four hundred twenty-one thousand, eight hundred sixty-eight".