84427872447 has 4 divisors (see below), whose sum is σ = 112570496600. Its totient is φ = 56285248296.

The previous prime is 84427872443. The next prime is 84427872457. The reversal of 84427872447 is 74427872448.

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

It is not a de Polignac number, because 84427872447 - 2² = 84427872443 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 (84427872443) 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 3 ways as a sum of consecutive naturals, for example, 14071312072 + ... + 14071312077.

It is an arithmetic number, because the mean of its divisors is an integer number (28142624150).

Almost surely, 2^84427872447 is an apocalyptic number.

84427872447 is a deficient number, since it is larger than the sum of its proper divisors (28142624153).

84427872447 is a wasteful number, since it uses less digits than its factorization.

84427872447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28142624152.

The product of its digits is 22478848, while the sum is 57.

Subtracting from 84427872447 its reverse (74427872448), we obtain a palindrome (9999999999).

The spelling of 84427872447 in words is "eighty-four billion, four hundred twenty-seven million, eight hundred seventy-two thousand, four hundred forty-seven".