28117438173 has 64 divisors (see below), whose sum is σ = 48946867200. Its totient is φ = 15768406080.

The previous prime is 28117438171. The next prime is 28117438183. The reversal of 28117438173 is 37183471182.

28117438173 is a `hidden beast` number, since 281 + 174 + 38 + 173 = 666.

It is not a de Polignac number, because 28117438173 - 2¹ = 28117438171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117438171) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 184711 + ... + 300587.

It is an arithmetic number, because the mean of its divisors is an integer number (764794800).

Almost surely, 2^28117438173 is an apocalyptic number.

It is an amenable number.

28117438173 is a deficient number, since it is larger than the sum of its proper divisors (20829429027).

28117438173 is a wasteful number, since it uses less digits than its factorization.

28117438173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115959 (or 115953 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The spelling of 28117438173 in words is "twenty-eight billion, one hundred seventeen million, four hundred thirty-eight thousand, one hundred seventy-three".