6721280 has 72 divisors (see below), whose sum is σ = 16556400. Its totient is φ = 2613248.

The previous prime is 6721277. The next prime is 6721283. The reversal of 6721280 is 821276.

It is an interprime number because it is at equal distance from previous prime (6721277) and next prime (6721283).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721283) 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, 75476 + ... + 75564.

It is an arithmetic number, because the mean of its divisors is an integer number (229950).

Almost surely, 2^6721280 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 6721280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8278200).

6721280 is an abundant number, since it is smaller than the sum of its proper divisors (9835120).

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

6721280 is an equidigital number, since it uses as much as digits as its factorization.

6721280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 6721280 is about 2592.5431529678. The cubic root of 6721280 is about 188.7197398970.

The spelling of 6721280 in words is "six million, seven hundred twenty-one thousand, two hundred eighty".