82789977847 has 4 divisors (see below), whose sum is σ = 82816869520. Its totient is φ = 82763086176.

The previous prime is 82789977841. The next prime is 82789977899. The reversal of 82789977847 is 74877998728.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82789977847 - 2¹⁵ = 82789945079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82789977841) 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, 13441218 + ... + 13447375.

It is an arithmetic number, because the mean of its divisors is an integer number (20704217380).

Almost surely, 2^82789977847 is an apocalyptic number.

82789977847 is a deficient number, since it is larger than the sum of its proper divisors (26891673).

82789977847 is a wasteful number, since it uses less digits than its factorization.

82789977847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26891672.

The product of its digits is 796594176, while the sum is 76.

The spelling of 82789977847 in words is "eighty-two billion, seven hundred eighty-nine million, nine hundred seventy-seven thousand, eight hundred forty-seven".