82576139778 has 96 divisors (see below), whose sum is σ = 196165569600. Its totient is φ = 24897041280.

The previous prime is 82576139759. The next prime is 82576139791. The reversal of 82576139778 is 87793167528.

82576139778 is a `hidden beast` number, since 8 + 2 + 5 + 7 + 613 + 9 + 7 + 7 + 8 = 666.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 53308548 + ... + 53310096.

It is an arithmetic number, because the mean of its divisors is an integer number (2043391350).

Almost surely, 2^82576139778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82576139778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98082784800).

82576139778 is an abundant number, since it is smaller than the sum of its proper divisors (113589429822).

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

82576139778 is a wasteful number, since it uses less digits than its factorization.

82576139778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752 (or 2749 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 82576139778 in words is "eighty-two billion, five hundred seventy-six million, one hundred thirty-nine thousand, seven hundred seventy-eight".