83128309 has 8 divisors (see below), whose sum is σ = 90892800. Its totient is φ = 75398400.

The previous prime is 83128301. The next prime is 83128319. The reversal of 83128309 is 90382138.

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

It is not a de Polignac number, because 83128309 - 2³ = 83128301 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 (83128301) 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, 3477 + ... + 13354.

It is an arithmetic number, because the mean of its divisors is an integer number (11361600).

Almost surely, 2^83128309 is an apocalyptic number.

It is an amenable number.

83128309 is a deficient number, since it is larger than the sum of its proper divisors (7764491).

83128309 is a wasteful number, since it uses less digits than its factorization.

83128309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17291.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 83128309 is about 9117.4727309710. The cubic root of 83128309 is about 436.4317276937.

The spelling of 83128309 in words is "eighty-three million, one hundred twenty-eight thousand, three hundred nine".