86628221 has 4 divisors (see below), whose sum is σ = 86651100. Its totient is φ = 86605344.

The previous prime is 86628197. The next prime is 86628257. The reversal of 86628221 is 12282668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41925625 + 44702596 = 6475^2 + 6686^2 .

It is a cyclic number.

It is not a de Polignac number, because 86628221 - 2¹⁰ = 86627197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86628271) 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, 4256 + ... + 13833.

It is an arithmetic number, because the mean of its divisors is an integer number (21662775).

Almost surely, 2^86628221 is an apocalyptic number.

It is an amenable number.

86628221 is a deficient number, since it is larger than the sum of its proper divisors (22879).

86628221 is a wasteful number, since it uses less digits than its factorization.

86628221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22878.

The product of its digits is 18432, while the sum is 35.

The square root of 86628221 is about 9307.4282699358. The cubic root of 86628221 is about 442.4726845364.

The spelling of 86628221 in words is "eighty-six million, six hundred twenty-eight thousand, two hundred twenty-one".