82780223 has 4 divisors (see below), whose sum is σ = 84342168. Its totient is φ = 81218280.

The previous prime is 82780183. The next prime is 82780237. The reversal of 82780223 is 32208728.

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

It is a cyclic number.

It is not a de Polignac number, because 82780223 - 2²⁰ = 81731647 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 82780223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82780253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780893 + ... + 780998.

It is an arithmetic number, because the mean of its divisors is an integer number (21085542).

Almost surely, 2^82780223 is an apocalyptic number.

82780223 is a deficient number, since it is larger than the sum of its proper divisors (1561945).

82780223 is a wasteful number, since it uses less digits than its factorization.

82780223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561944.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 82780223 is about 9098.3637539945. The cubic root of 82780223 is about 435.8217136421.

The spelling of 82780223 in words is "eighty-two million, seven hundred eighty thousand, two hundred twenty-three".