28172921194 has 32 divisors (see below), whose sum is σ = 48556647360. Its totient is φ = 12124598400.

The previous prime is 28172921173. The next prime is 28172921207. The reversal of 28172921194 is 49112927182.

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 in 15 ways as a sum of consecutive naturals, for example, 708382 + ... + 747094.

It is an arithmetic number, because the mean of its divisors is an integer number (1517395230).

Almost surely, 2^28172921194 is an apocalyptic number.

28172921194 is a deficient number, since it is larger than the sum of its proper divisors (20383726166).

28172921194 is a wasteful number, since it uses less digits than its factorization.

28172921194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40486.

The product of its digits is 145152, while the sum is 46.

The spelling of 28172921194 in words is "twenty-eight billion, one hundred seventy-two million, nine hundred twenty-one thousand, one hundred ninety-four".