6731840 has 56 divisors (see below), whose sum is σ = 16261080. Its totient is φ = 2654208.

The previous prime is 6731821. The next prime is 6731843. The reversal of 6731840 is 481376.

It can be written as a sum of positive squares in 4 ways, for example, as 541696 + 6190144 = 736^2 + 2488^2 .

It is not an unprimeable number, because it can be changed into a prime (6731843) 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, 34784 + ... + 34976.

Almost surely, 2^6731840 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 6731840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8130540).

6731840 is an abundant number, since it is smaller than the sum of its proper divisors (9529240).

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

6731840 is a wasteful number, since it uses less digits than its factorization.

6731840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 6731840 is about 2594.5789639169. The cubic root of 6731840 is about 188.8185225531.

The spelling of 6731840 in words is "six million, seven hundred thirty-one thousand, eight hundred forty".