6921427968 has 660 divisors, whose sum is σ = 26090357832. Its totient is φ = 1811496960.

The previous prime is 6921427937. The next prime is 6921427987. The reversal of 6921427968 is 8697241296.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 59 ways as a sum of consecutive naturals, for example, 52835263 + ... + 52835393.

Almost surely, 2^6921427968 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 6921427968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13045178916).

6921427968 is an abundant number, since it is smaller than the sum of its proper divisors (19168929864).

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

6921427968 is a wasteful number, since it uses less digits than its factorization.

6921427968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 156 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 6921427968 is about 83195.1198568762. The cubic root of 6921427968 is about 1905.7469548935.

The spelling of 6921427968 in words is "six billion, nine hundred twenty-one million, four hundred twenty-seven thousand, nine hundred sixty-eight".