6731728 has 20 divisors (see below), whose sum is σ = 13810500. Its totient is φ = 3167744.

The previous prime is 6731717. The next prime is 6731729. The reversal of 6731728 is 8271376.

It can be written as a sum of positive squares in 2 ways, for example, as 6110784 + 620944 = 2472^2 + 788^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 6731693 and 6731702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6731729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12103 + ... + 12646.

It is an arithmetic number, because the mean of its divisors is an integer number (690525).

Almost surely, 2^6731728 is an apocalyptic number.

6731728 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6731728 is an abundant number, since it is smaller than the sum of its proper divisors (7078772).

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

6731728 is a wasteful number, since it uses less digits than its factorization.

6731728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24774 (or 24768 counting only the distinct ones).

The product of its digits is 14112, while the sum is 34.

The square root of 6731728 is about 2594.5573803637. The cubic root of 6731728 is about 188.8174754005.

It can be divided in two parts, 673 and 1728, that added together give a 4-th power (2401 = 7⁴).

The spelling of 6731728 in words is "six million, seven hundred thirty-one thousand, seven hundred twenty-eight".