82109392780 has 24 divisors (see below), whose sum is σ = 172440325008. Its totient is φ = 32841738048.

The previous prime is 82109392769. The next prime is 82109392787. The reversal of 82109392780 is 8729390128.

It is a super-2 number, since 2×82109392780² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82109392787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232087 + ... + 466993.

It is an arithmetic number, because the mean of its divisors is an integer number (7185013542).

Almost surely, 2^82109392780 is an apocalyptic number.

It is an amenable number.

82109392780 is an abundant number, since it is smaller than the sum of its proper divisors (90330932228).

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

82109392780 is a wasteful number, since it uses less digits than its factorization.

82109392780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252393 (or 252391 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 82109392780 in words is "eighty-two billion, one hundred nine million, three hundred ninety-two thousand, seven hundred eighty".