8720173 has 16 divisors (see below), whose sum is σ = 10938240. Its totient is φ = 6753600.

The previous prime is 8720171. The next prime is 8720177. The reversal of 8720173 is 3710278.

It is a happy number.

It is not a de Polignac number, because 8720173 - 2¹ = 8720171 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20503 + ... + 20923.

It is an arithmetic number, because the mean of its divisors is an integer number (683640).

Almost surely, 2^8720173 is an apocalyptic number.

It is an amenable number.

8720173 is a deficient number, since it is larger than the sum of its proper divisors (2218067).

8720173 is a wasteful number, since it uses less digits than its factorization.

8720173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 8720173 is about 2952.9939044976. The cubic root of 8720173 is about 205.8298544800.

The spelling of 8720173 in words is "eight million, seven hundred twenty thousand, one hundred seventy-three".