28286877172 has 24 divisors (see below), whose sum is σ = 49982211720. Its totient is φ = 14006737920.

The previous prime is 28286877163. The next prime is 28286877187. The reversal of 28286877172 is 27177868282.

It can be written as a sum of positive squares in 4 ways, for example, as 50779876 + 28236097296 = 7126^2 + 168036^2 .

It is a congruent number.

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, 169404 + ... + 292012.

It is an arithmetic number, because the mean of its divisors is an integer number (2082592155).

Almost surely, 2^28286877172 is an apocalyptic number.

It is an amenable number.

28286877172 is a deficient number, since it is larger than the sum of its proper divisors (21695334548).

28286877172 is a wasteful number, since it uses less digits than its factorization.

28286877172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123171 (or 123169 counting only the distinct ones).

The product of its digits is 8429568, while the sum is 58.

The spelling of 28286877172 in words is "twenty-eight billion, two hundred eighty-six million, eight hundred seventy-seven thousand, one hundred seventy-two".