82779222 has 16 divisors (see below), whose sum is σ = 175297392. Its totient is φ = 25969920.

The previous prime is 82779217. The next prime is 82779227. The reversal of 82779222 is 22297728.

It is an interprime number because it is at equal distance from previous prime (82779217) and next prime (82779227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82779227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405679 + ... + 405882.

It is an arithmetic number, because the mean of its divisors is an integer number (10956087).

Almost surely, 2^82779222 is an apocalyptic number.

82779222 is an abundant number, since it is smaller than the sum of its proper divisors (92518170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82779222 is a wasteful number, since it uses less digits than its factorization.

82779222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811583.

The product of its digits is 56448, while the sum is 39.

The square root of 82779222 is about 9098.3087439370. The cubic root of 82779222 is about 435.8199569452.

The spelling of 82779222 in words is "eighty-two million, seven hundred seventy-nine thousand, two hundred twenty-two".