6723840 has 144 divisors (see below), whose sum is σ = 22958208. Its totient is φ = 1671168.

The previous prime is 6723803. The next prime is 6723863. The reversal of 6723840 is 483276.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a zygodrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 6723798 and 6723807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65229 + ... + 65331.

It is an arithmetic number, because the mean of its divisors is an integer number (159432).

Almost surely, 2^6723840 is an apocalyptic number.

6723840 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 6723840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11479104).

6723840 is an abundant number, since it is smaller than the sum of its proper divisors (16234368).

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

6723840 is a wasteful number, since it uses less digits than its factorization.

6723840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 6723840 is about 2593.0368296652. The cubic root of 6723840 is about 188.7436967034.

The spelling of 6723840 in words is "six million, seven hundred twenty-three thousand, eight hundred forty".