82777131980 has 12 divisors (see below), whose sum is σ = 173831977200. Its totient is φ = 33110852784.

The previous prime is 82777131979. The next prime is 82777131989. The reversal of 82777131980 is 8913177728.

It is not an unprimeable number, because it can be changed into a prime (82777131989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2069428280 + ... + 2069428319.

It is an arithmetic number, because the mean of its divisors is an integer number (14485998100).

Almost surely, 2^82777131980 is an apocalyptic number.

It is an amenable number.

82777131980 is an abundant number, since it is smaller than the sum of its proper divisors (91054845220).

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

82777131980 is a wasteful number, since it uses less digits than its factorization.

82777131980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138856608 (or 4138856606 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 53.

The spelling of 82777131980 in words is "eighty-two billion, seven hundred seventy-seven million, one hundred thirty-one thousand, nine hundred eighty".