82778228 has 18 divisors (see below), whose sum is σ = 156863574. Its totient is φ = 38205024.

The previous prime is 82778203. The next prime is 82778237. The reversal of 82778228 is 82287728.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4624 + 82773604 = 68^2 + 9098^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60551 + ... + 61902.

It is an arithmetic number, because the mean of its divisors is an integer number (8714643).

Almost surely, 2^82778228 is an apocalyptic number.

It is an amenable number.

82778228 is a deficient number, since it is larger than the sum of its proper divisors (74085346).

82778228 is a wasteful number, since it uses less digits than its factorization.

82778228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122483 (or 122468 counting only the distinct ones).

The product of its digits is 200704, while the sum is 44.

The square root of 82778228 is about 9098.2541182361. The cubic root of 82778228 is about 435.8182125188.

The spelling of 82778228 in words is "eighty-two million, seven hundred seventy-eight thousand, two hundred twenty-eight".