8279128821 has 8 divisors (see below), whose sum is σ = 11178570880. Its totient is φ = 5449552992.

The previous prime is 8279128807. The next prime is 8279128831. The reversal of 8279128821 is 1288219728.

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

It is not a de Polignac number, because 8279128821 - 2⁶ = 8279128757 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 (8279128831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17466280 + ... + 17466753.

It is an arithmetic number, because the mean of its divisors is an integer number (1397321360).

Almost surely, 2^8279128821 is an apocalyptic number.

It is an amenable number.

8279128821 is a deficient number, since it is larger than the sum of its proper divisors (2899442059).

8279128821 is a wasteful number, since it uses less digits than its factorization.

8279128821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34933115.

The product of its digits is 258048, while the sum is 48.

The square root of 8279128821 is about 90989.7182158512. The cubic root of 8279128821 is about 2022.9953292017.

The spelling of 8279128821 in words is "eight billion, two hundred seventy-nine million, one hundred twenty-eight thousand, eight hundred twenty-one".