6991338720 has 48 divisors (see below), whose sum is σ = 22022718480. Its totient is φ = 1864356864.

The previous prime is 6991338707. The next prime is 6991338721. The reversal of 6991338720 is 278331996.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a self number, because there is not a number n which added to its sum of digits gives 6991338720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991338721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7282165 + ... + 7283124.

It is an arithmetic number, because the mean of its divisors is an integer number (458806635).

Almost surely, 2^6991338720 is an apocalyptic number.

6991338720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6991338720 is an abundant number, since it is smaller than the sum of its proper divisors (15031379760).

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

6991338720 is a wasteful number, since it uses less digits than its factorization.

6991338720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14565307 (or 14565299 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 6991338720 is about 83614.2255839280. The cubic root of 6991338720 is about 1912.1418841623.

The spelling of 6991338720 in words is "six billion, nine hundred ninety-one million, three hundred thirty-eight thousand, seven hundred twenty".