28279166788 has 24 divisors (see below), whose sum is σ = 49790220480. Its totient is φ = 14053470240.

The previous prime is 28279166767. The next prime is 28279166801. The reversal of 28279166788 is 88766197282.

It is a super-2 number, since 2×28279166788² (a number of 22 digits) contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 1581345 + ... + 1599127.

It is an arithmetic number, because the mean of its divisors is an integer number (2074592520).

Almost surely, 2^28279166788 is an apocalyptic number.

It is an amenable number.

28279166788 is a deficient number, since it is larger than the sum of its proper divisors (21511053692).

28279166788 is a wasteful number, since it uses less digits than its factorization.

28279166788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20187 (or 20185 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 64.

The spelling of 28279166788 in words is "twenty-eight billion, two hundred seventy-nine million, one hundred sixty-six thousand, seven hundred eighty-eight".