1328728 has 16 divisors (see below), whose sum is σ = 2552760. Its totient is φ = 648000.

The previous prime is 1328711. The next prime is 1328729. The reversal of 1328728 is 8278231.

It is a self number, because there is not a number n which added to its sum of digits gives 1328728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1698 + ... + 2353.

2^1328728 is an apocalyptic number.

It is an amenable number.

1328728 is a deficient number, since it is larger than the sum of its proper divisors (1224032).

1328728 is a wasteful number, since it uses less digits than its factorization.

1328728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098 (or 4094 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 1328728 is about 1152.7046456053. The cubic root of 1328728 is about 109.9373748213.

The spelling of 1328728 in words is "one million, three hundred twenty-eight thousand, seven hundred twenty-eight".