66928873 has 16 divisors (see below), whose sum is σ = 76824576. Its totient is φ = 57713040.

The previous prime is 66928859. The next prime is 66928889. The reversal of 66928873 is 37882966.

It is not a de Polignac number, because 66928873 - 2²⁵ = 33374441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66928853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31090 + ... + 33172.

It is an arithmetic number, because the mean of its divisors is an integer number (4801536).

Almost surely, 2^66928873 is an apocalyptic number.

It is an amenable number.

66928873 is a deficient number, since it is larger than the sum of its proper divisors (9895703).

66928873 is a wasteful number, since it uses less digits than its factorization.

66928873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244.

The product of its digits is 870912, while the sum is 49.

The square root of 66928873 is about 8181.0068451261. The cubic root of 66928873 is about 406.0110349108.

The spelling of 66928873 in words is "sixty-six million, nine hundred twenty-eight thousand, eight hundred seventy-three".