6991246128 has 60 divisors (see below), whose sum is σ = 18239096760. Its totient is φ = 2307621888.

The previous prime is 6991246109. The next prime is 6991246177. The reversal of 6991246128 is 8216421996.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 502368 + ... + 516096.

It is an arithmetic number, because the mean of its divisors is an integer number (303984946).

Almost surely, 2^6991246128 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 6991246128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9119548380).

6991246128 is an abundant number, since it is smaller than the sum of its proper divisors (11247850632).

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

6991246128 is a wasteful number, since it uses less digits than its factorization.

6991246128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13946 (or 13837 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 6991246128 is about 83613.6718964070. The cubic root of 6991246128 is about 1912.1334427736.

The spelling of 6991246128 in words is "six billion, nine hundred ninety-one million, two hundred forty-six thousand, one hundred twenty-eight".