6921888336 has 120 divisors (see below), whose sum is σ = 21197077824. Its totient is φ = 2091156480.

The previous prime is 6921888313. The next prime is 6921888343. The reversal of 6921888336 is 6338881296.

It is a happy number.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 527325 + ... + 540291.

Almost surely, 2^6921888336 is an apocalyptic number.

6921888336 is a gapful number since it is divisible by the number (66) 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 6921888336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10598538912).

6921888336 is an abundant number, since it is smaller than the sum of its proper divisors (14275189488).

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

6921888336 is a wasteful number, since it uses less digits than its factorization.

6921888336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13329 (or 13320 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 6921888336 is about 83197.8866077739. The cubic root of 6921888336 is about 1905.7892065535.

The spelling of 6921888336 in words is "six billion, nine hundred twenty-one million, eight hundred eighty-eight thousand, three hundred thirty-six".