28784680173 has 48 divisors (see below), whose sum is σ = 45293476800. Its totient is φ = 17552920320.

The previous prime is 28784680163. The next prime is 28784680193. The reversal of 28784680173 is 37108648782.

It is a happy number.

28784680173 is a `hidden beast` number, since 2 + 8 + 7 + 8 + 468 + 0 + 173 = 666.

It is not a de Polignac number, because 28784680173 - 2¹⁸ = 28784418029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784680153) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 811473 + ... + 846201.

It is an arithmetic number, because the mean of its divisors is an integer number (943614100).

Almost surely, 2^28784680173 is an apocalyptic number.

It is an amenable number.

28784680173 is a deficient number, since it is larger than the sum of its proper divisors (16508796627).

28784680173 is a wasteful number, since it uses less digits than its factorization.

28784680173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34922 (or 34919 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 28784680173 in words is "twenty-eight billion, seven hundred eighty-four million, six hundred eighty thousand, one hundred seventy-three".