6421280 has 48 divisors (see below), whose sum is σ = 15422400. Its totient is φ = 2525952.

The previous prime is 6421279. The next prime is 6421339. The reversal of 6421280 is 821246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10421 + ... + 11019.

It is an arithmetic number, because the mean of its divisors is an integer number (321300).

Almost surely, 2^6421280 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 6421280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7711200).

6421280 is an abundant number, since it is smaller than the sum of its proper divisors (9001120).

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

6421280 is a wasteful number, since it uses less digits than its factorization.

6421280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 6421280 is about 2534.0244671273. The cubic root of 6421280 is about 185.8691028002.

The spelling of 6421280 in words is "six million, four hundred twenty-one thousand, two hundred eighty".