82860221 has 16 divisors (see below), whose sum is σ = 88482240. Its totient is φ = 77454720.

The previous prime is 82860209. The next prime is 82860229. The reversal of 82860221 is 12206828.

It is a cyclic number.

It is not a de Polignac number, because 82860221 - 2¹⁰ = 82859197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82860229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269750 + ... + 270056.

It is an arithmetic number, because the mean of its divisors is an integer number (5530140).

Almost surely, 2^82860221 is an apocalyptic number.

It is an amenable number.

82860221 is a deficient number, since it is larger than the sum of its proper divisors (5622019).

82860221 is a wasteful number, since it uses less digits than its factorization.

82860221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 82860221 is about 9102.7589773650. The cubic root of 82860221 is about 435.9620597264.

The spelling of 82860221 in words is "eighty-two million, eight hundred sixty thousand, two hundred twenty-one".