28319279816 has 32 divisors (see below), whose sum is σ = 54061318080. Its totient is φ = 13904520000.

The previous prime is 28319279789. The next prime is 28319279921. The reversal of 28319279816 is 61897291382.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

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, 43250 + ... + 241886.

It is an arithmetic number, because the mean of its divisors is an integer number (1689416190).

Almost surely, 2^28319279816 is an apocalyptic number.

It is an amenable number.

28319279816 is a deficient number, since it is larger than the sum of its proper divisors (25742038264).

28319279816 is a wasteful number, since it uses less digits than its factorization.

28319279816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198965 (or 198961 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 56.

The spelling of 28319279816 in words is "twenty-eight billion, three hundred nineteen million, two hundred seventy-nine thousand, eight hundred sixteen".