6421760 has 72 divisors (see below), whose sum is σ = 16004520. Its totient is φ = 2465792.

The previous prime is 6421759. The next prime is 6421763. The reversal of 6421760 is 671246.

It can be written as a sum of positive squares in 4 ways, for example, as 1893376 + 4528384 = 1376^2 + 2128^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421763) 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, 37034 + ... + 37206.

It is an arithmetic number, because the mean of its divisors is an integer number (222285).

Almost surely, 2^6421760 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 6421760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8002260).

6421760 is an abundant number, since it is smaller than the sum of its proper divisors (9582760).

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

6421760 is a wasteful number, since it uses less digits than its factorization.

6421760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 6421760 is about 2534.1191763609. The cubic root of 6421760 is about 185.8737340132.

The spelling of 6421760 in words is "six million, four hundred twenty-one thousand, seven hundred sixty".