83720873 has 4 divisors (see below), whose sum is σ = 83800260. Its totient is φ = 83641488.

The previous prime is 83720849. The next prime is 83720911. The reversal of 83720873 is 37802738.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40857664 + 42863209 = 6392^2 + 6547^2 .

It is a cyclic number.

It is not a de Polignac number, because 83720873 - 2¹⁶ = 83655337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83720473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38090 + ... + 40227.

It is an arithmetic number, because the mean of its divisors is an integer number (20950065).

Almost surely, 2^83720873 is an apocalyptic number.

It is an amenable number.

83720873 is a deficient number, since it is larger than the sum of its proper divisors (79387).

83720873 is a wasteful number, since it uses less digits than its factorization.

83720873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79386.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 83720873 is about 9149.9110924642. The cubic root of 83720873 is about 437.4662796324.

The spelling of 83720873 in words is "eighty-three million, seven hundred twenty thousand, eight hundred seventy-three".