6979321856 has 60 divisors (see below), whose sum is σ = 15032385522. Its totient is φ = 3221225472.

The previous prime is 6979321847. The next prime is 6979321901. The reversal of 6979321856 is 6581239796.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6710886400 + 268435456 = 81920^2 + 16384^2 .

Its product of digits (4898880) is a multiple of the sum of its prime divisors (15).

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536870906 + ... + 536870918.

Almost surely, 2^6979321856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6979321856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7516192761).

6979321856 is an abundant number, since it is smaller than the sum of its proper divisors (8053063666).

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

6979321856 is an frugal number, since it uses more digits than its factorization.

6979321856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 15 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 56.

The square root of 6979321856 is about 83542.3357107042. The cubic root of 6979321856 is about 1911.0457122904.

The spelling of 6979321856 in words is "six billion, nine hundred seventy-nine million, three hundred twenty-one thousand, eight hundred fifty-six".