6728340 has 24 divisors (see below), whose sum is σ = 18839520. Its totient is φ = 1794208.

The previous prime is 6728327. The next prime is 6728347. The reversal of 6728340 is 438276.

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

It is a junction number, because it is equal to n+sod(n) for n = 6728298 and 6728307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728347) by changing a digit.

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, 56010 + ... + 56129.

It is an arithmetic number, because the mean of its divisors is an integer number (784980).

Almost surely, 2^6728340 is an apocalyptic number.

6728340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6728340 is an abundant number, since it is smaller than the sum of its proper divisors (12111180).

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

6728340 is a wasteful number, since it uses less digits than its factorization.

6728340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112151 (or 112149 counting only the distinct ones).

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

The square root of 6728340 is about 2593.9043929952. The cubic root of 6728340 is about 188.7857935423.

Subtracting from 6728340 its product of nonzero digits (8064), we obtain a palindrome (6720276).

Subtracting from 6728340 its reverse (438276), we obtain a square (6290064 = 2508²).

The spelling of 6728340 in words is "six million, seven hundred twenty-eight thousand, three hundred forty".