28881573166 has 4 divisors (see below), whose sum is σ = 43322359752. Its totient is φ = 14440786582.

The previous prime is 28881573157. The next prime is 28881573187. The reversal of 28881573166 is 66137518882.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×28881573166² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7220393290 + ... + 7220393293.

It is an arithmetic number, because the mean of its divisors is an integer number (10830589938).

Almost surely, 2^28881573166 is an apocalyptic number.

28881573166 is a deficient number, since it is larger than the sum of its proper divisors (14440786586).

28881573166 is a wasteful number, since it uses less digits than its factorization.

28881573166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14440786585.

The product of its digits is 3870720, while the sum is 55.

The spelling of 28881573166 in words is "twenty-eight billion, eight hundred eighty-one million, five hundred seventy-three thousand, one hundred sixty-six".