83128809 has 8 divisors (see below), whose sum is σ = 110907712. Its totient is φ = 55384560.

The previous prime is 83128807. The next prime is 83128813. The reversal of 83128809 is 90882138.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 83128809 - 2¹ = 83128807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83128807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2422 + ... + 13119.

It is an arithmetic number, because the mean of its divisors is an integer number (13863464).

Almost surely, 2^83128809 is an apocalyptic number.

It is an amenable number.

83128809 is a deficient number, since it is larger than the sum of its proper divisors (27778903).

83128809 is a wasteful number, since it uses less digits than its factorization.

83128809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17327.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 83128809 is about 9117.5001508089. The cubic root of 83128809 is about 436.4326027082.

The spelling of 83128809 in words is "eighty-three million, one hundred twenty-eight thousand, eight hundred nine".