82109185780 has 24 divisors (see below), whose sum is σ = 172481226120. Its totient is φ = 32833781760.

The previous prime is 82109185733. The next prime is 82109185793. The reversal of 82109185780 is 8758190128.

It can be written as a sum of positive squares in 4 ways, for example, as 126607504 + 81982578276 = 11252^2 + 286326^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550041 + ... + 683200.

It is an arithmetic number, because the mean of its divisors is an integer number (7186717755).

Almost surely, 2^82109185780 is an apocalyptic number.

It is an amenable number.

82109185780 is an abundant number, since it is smaller than the sum of its proper divisors (90372040340).

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

82109185780 is a wasteful number, since it uses less digits than its factorization.

82109185780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236579 (or 1236577 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 49.

The spelling of 82109185780 in words is "eighty-two billion, one hundred nine million, one hundred eighty-five thousand, seven hundred eighty".