6728640 has 112 divisors (see below), whose sum is σ = 21994368. Its totient is φ = 1741824.

The previous prime is 6728639. The next prime is 6728653. The reversal of 6728640 is 468276.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 41199 + ... + 41361.

Almost surely, 2^6728640 is an apocalyptic number.

6728640 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 6728640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10997184).

6728640 is an abundant number, since it is smaller than the sum of its proper divisors (15265728).

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

6728640 is a wasteful number, since it uses less digits than its factorization.

6728640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 6728640 is about 2593.9622202337. The cubic root of 6728640 is about 188.7885993307.

The spelling of 6728640 in words is "six million, seven hundred twenty-eight thousand, six hundred forty".