28708173 has 24 divisors (see below), whose sum is σ = 46202520. Its totient is φ = 17055360.

The previous prime is 28708111. The next prime is 28708181. The reversal of 28708173 is 37180782.

It can be written as a sum of positive squares in 4 ways, for example, as 4235364 + 24472809 = 2058^2 + 4947^2 .

It is not a de Polignac number, because 28708173 - 2⁹ = 28707661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28708193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 838 + ... + 7623.

It is an arithmetic number, because the mean of its divisors is an integer number (1925105).

Almost surely, 2^28708173 is an apocalyptic number.

It is an amenable number.

28708173 is a deficient number, since it is larger than the sum of its proper divisors (17494347).

28708173 is a wasteful number, since it uses less digits than its factorization.

28708173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8509 (or 8506 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28708173 is about 5358.0008398656. Note that the first 3 decimals coincide. The cubic root of 28708173 is about 306.1976488052.

The spelling of 28708173 in words is "twenty-eight million, seven hundred eight thousand, one hundred seventy-three".