81876839782 has 8 divisors (see below), whose sum is σ = 122817965400. Its totient is φ = 40937517984.

The previous prime is 81876839771. The next prime is 81876839797. The reversal of 81876839782 is 28793867818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331107 + ... + 522862.

It is an arithmetic number, because the mean of its divisors is an integer number (15352245675).

Almost surely, 2^81876839782 is an apocalyptic number.

81876839782 is a deficient number, since it is larger than the sum of its proper divisors (40941125618).

81876839782 is a wasteful number, since it uses less digits than its factorization.

81876839782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901910.

The product of its digits is 65028096, while the sum is 67.

The spelling of 81876839782 in words is "eighty-one billion, eight hundred seventy-six million, eight hundred thirty-nine thousand, seven hundred eighty-two".