1320728 has 16 divisors (see below), whose sum is σ = 2607000. Its totient is φ = 625536.

The previous prime is 1320727. The next prime is 1320731. The reversal of 1320728 is 8270231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320721) 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, 4193 + ... + 4496.

2^1320728 is an apocalyptic number.

It is an amenable number.

1320728 is a deficient number, since it is larger than the sum of its proper divisors (1286272).

1320728 is a wasteful number, since it uses less digits than its factorization.

1320728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8714 (or 8710 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1320728 is about 1149.2293069705. The cubic root of 1320728 is about 109.7162937019.

Adding to 1320728 its reverse (8270231), we get a palindrome (9590959).

It can be divided in two parts, 1320 and 728, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1320728 in words is "one million, three hundred twenty thousand, seven hundred twenty-eight".