28172921195 has 16 divisors (see below), whose sum is σ = 33990723360. Its totient is φ = 22416393984.

The previous prime is 28172921173. The next prime is 28172921207. The reversal of 28172921195 is 59112927182.

It is a cyclic number.

It is not a de Polignac number, because 28172921195 - 2⁸ = 28172920939 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160441 + ... + 1184469.

It is an arithmetic number, because the mean of its divisors is an integer number (2124420210).

Almost surely, 2^28172921195 is an apocalyptic number.

28172921195 is a deficient number, since it is larger than the sum of its proper divisors (5817802165).

28172921195 is a wasteful number, since it uses less digits than its factorization.

28172921195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25294.

The product of its digits is 181440, while the sum is 47.

The spelling of 28172921195 in words is "twenty-eight billion, one hundred seventy-two million, nine hundred twenty-one thousand, one hundred ninety-five".