6728994 has 40 divisors (see below), whose sum is σ = 15311340. Its totient is φ = 2208384.

The previous prime is 6728977. The next prime is 6729007. The reversal of 6728994 is 4998276.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6579225 + 149769 = 2565^2 + 387^2 .

It is a Curzon number.

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 19 ways as a sum of consecutive naturals, for example, 11542 + ... + 12110.

Almost surely, 2^6728994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6728994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7655670).

6728994 is an abundant number, since it is smaller than the sum of its proper divisors (8582346).

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

6728994 is a wasteful number, since it uses less digits than its factorization.

6728994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 647 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 6728994 is about 2594.0304547171. The cubic root of 6728994 is about 188.7919100539.

It can be divided in two parts, 6 and 728994, that added together give a cube (729000 = 90³).

The spelling of 6728994 in words is "six million, seven hundred twenty-eight thousand, nine hundred ninety-four".