6720784173 has 6 divisors (see below), whose sum is σ = 9707799374. Its totient is φ = 4480522776.

The previous prime is 6720784171. The next prime is 6720784183. The reversal of 6720784173 is 3714870276.

It can be written as a sum of positive squares in only one way, i.e., 5950888164 + 769896009 = 77142^2 + 27747^2 .

It is not a de Polignac number, because 6720784173 - 2¹ = 6720784171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720784171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 373376890 + ... + 373376907.

Almost surely, 2^6720784173 is an apocalyptic number.

It is an amenable number.

6720784173 is a deficient number, since it is larger than the sum of its proper divisors (2987015201).

6720784173 is a wasteful number, since it uses less digits than its factorization.

6720784173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746753803 (or 746753800 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The square root of 6720784173 is about 81980.3889537004. The cubic root of 6720784173 is about 1887.1509918161.

The spelling of 6720784173 in words is "six billion, seven hundred twenty million, seven hundred eighty-four thousand, one hundred seventy-three".