82788169 has 2 divisors, whose sum is σ = 82788170. Its totient is φ = 82788168.

The previous prime is 82788161. The next prime is 82788191. The reversal of 82788169 is 96188728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81812025 + 976144 = 9045^2 + 988^2 .

It is a cyclic number.

It is not a de Polignac number, because 82788169 - 2³ = 82788161 is a prime.

It is a super-2 number, since 2×82788169² = 13707761852745122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82788161) 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 as a sum of consecutive naturals, namely, 41394084 + 41394085.

It is an arithmetic number, because the mean of its divisors is an integer number (41394085).

Almost surely, 2^82788169 is an apocalyptic number.

It is an amenable number.

82788169 is a deficient number, since it is larger than the sum of its proper divisors (1).

82788169 is an equidigital number, since it uses as much as digits as its factorization.

82788169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 82788169 is about 9098.8004154394. The cubic root of 82788169 is about 435.8356579089.

The spelling of 82788169 in words is "eighty-two million, seven hundred eighty-eight thousand, one hundred sixty-nine".