82805412 has 24 divisors (see below), whose sum is σ = 194334336. Its totient is φ = 27441568.

The previous prime is 82805381. The next prime is 82805413. The reversal of 82805412 is 21450828.

It is a self number, because there is not a number n which added to its sum of digits gives 82805412.

It is not an unprimeable number, because it can be changed into a prime (82805413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17868 + ... + 22019.

It is an arithmetic number, because the mean of its divisors is an integer number (8097264).

Almost surely, 2^82805412 is an apocalyptic number.

It is an amenable number.

82805412 is an abundant number, since it is smaller than the sum of its proper divisors (111528924).

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

82805412 is a wasteful number, since it uses less digits than its factorization.

82805412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40067 (or 40065 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 82805412 is about 9099.7479085961. The cubic root of 82805412 is about 435.8659142151.

The spelling of 82805412 in words is "eighty-two million, eight hundred five thousand, four hundred twelve".