83628021 has 4 divisors (see below), whose sum is σ = 111504032. Its totient is φ = 55752012.

The previous prime is 83628019. The next prime is 83628031. The reversal of 83628021 is 12082638.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 83628021 - 2¹ = 83628019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83628021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83628001) 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 3 ways as a sum of consecutive naturals, for example, 13938001 + ... + 13938006.

It is an arithmetic number, because the mean of its divisors is an integer number (27876008).

Almost surely, 2^83628021 is an apocalyptic number.

It is an amenable number.

83628021 is a deficient number, since it is larger than the sum of its proper divisors (27876011).

83628021 is a wasteful number, since it uses less digits than its factorization.

83628021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27876010.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 83628021 is about 9144.8357557695. The cubic root of 83628021 is about 437.3044934357.

The spelling of 83628021 in words is "eighty-three million, six hundred twenty-eight thousand, twenty-one".