83028221 has 8 divisors (see below), whose sum is σ = 88028280. Its totient is φ = 78041088.

The previous prime is 83028203. The next prime is 83028223. The reversal of 83028221 is 12282038.

It can be written as a sum of positive squares in 4 ways, for example, as 23136100 + 59892121 = 4810^2 + 7739^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83028221 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 (83028223) 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 7 ways as a sum of consecutive naturals, for example, 12125 + ... + 17693.

It is an arithmetic number, because the mean of its divisors is an integer number (11003535).

Almost surely, 2^83028221 is an apocalyptic number.

It is an amenable number.

83028221 is a deficient number, since it is larger than the sum of its proper divisors (5000059).

83028221 is a wasteful number, since it uses less digits than its factorization.

83028221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6463.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 83028221 is about 9111.9822761022. The cubic root of 83028221 is about 436.2565000961.

The spelling of 83028221 in words is "eighty-three million, twenty-eight thousand, two hundred twenty-one".