6991886880 has 288 divisors, whose sum is σ = 26399737728. Its totient is φ = 1670860800.

The previous prime is 6991886851. The next prime is 6991886899. The reversal of 6991886880 is 886881996.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×6991886880² = 97772964285432268800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1121532 + ... + 1127748.

It is an arithmetic number, because the mean of its divisors is an integer number (91665756).

Almost surely, 2^6991886880 is an apocalyptic number.

6991886880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6991886880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13199868864).

6991886880 is an abundant number, since it is smaller than the sum of its proper divisors (19407850848).

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

6991886880 is a wasteful number, since it uses less digits than its factorization.

6991886880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6320 (or 6309 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 63.

The square root of 6991886880 is about 83617.5034308009. The cubic root of 6991886880 is about 1912.1918570571.

The spelling of 6991886880 in words is "six billion, nine hundred ninety-one million, eight hundred eighty-six thousand, eight hundred eighty".