83128065 has 16 divisors (see below), whose sum is σ = 137592000. Its totient is φ = 42805952.

The previous prime is 83128061. The next prime is 83128099. The reversal of 83128065 is 56082138.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 83128065 - 2² = 83128061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83128061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95115 + ... + 95984.

It is an arithmetic number, because the mean of its divisors is an integer number (8599500).

Almost surely, 2^83128065 is an apocalyptic number.

It is an amenable number.

83128065 is a deficient number, since it is larger than the sum of its proper divisors (54463935).

83128065 is a wasteful number, since it uses less digits than its factorization.

83128065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191136.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 83128065 is about 9117.4593500602. The cubic root of 83128065 is about 436.4313006853.

The spelling of 83128065 in words is "eighty-three million, one hundred twenty-eight thousand, sixty-five".