83720109 has 16 divisors (see below), whose sum is σ = 121927680. Its totient is φ = 50675760.

The previous prime is 83720089. The next prime is 83720167. The reversal of 83720109 is 90102738.

It is a happy number.

It is not a de Polignac number, because 83720109 - 2¹² = 83716013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83720179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50902 + ... + 52520.

It is an arithmetic number, because the mean of its divisors is an integer number (7620480).

Almost surely, 2^83720109 is an apocalyptic number.

It is an amenable number.

83720109 is a deficient number, since it is larger than the sum of its proper divisors (38207571).

83720109 is a wasteful number, since it uses less digits than its factorization.

83720109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 83720109 is about 9149.8693433294. The cubic root of 83720109 is about 437.4649489198.

The spelling of 83720109 in words is "eighty-three million, seven hundred twenty thousand, one hundred nine".