6721440000 has 720 divisors, whose sum is σ = 26052660480. Its totient is φ = 1520640000.

The previous prime is 6721439993. The next prime is 6721440013. The reversal of 6721440000 is 441276.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 100319967 + ... + 100320033.

Almost surely, 2^6721440000 is an apocalyptic number.

6721440000 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 6721440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13026330240).

6721440000 is an abundant number, since it is smaller than the sum of its proper divisors (19331220480).

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

6721440000 is a wasteful number, since it uses less digits than its factorization.

6721440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 6721440000 is about 81984.3887578605. The cubic root of 6721440000 is about 1887.2123737564.

Adding to 6721440000 its reverse (441276), we get a palindrome (6721881276).

The spelling of 6721440000 in words is "six billion, seven hundred twenty-one million, four hundred forty thousand".