1306320728 has 16 divisors (see below), whose sum is σ = 2474603880. Its totient is φ = 646426368.

The previous prime is 1306320727. The next prime is 1306320761. The reversal of 1306320728 is 8270236031.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1306320694 and 1306320703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306320727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840926 + ... + 842477.

Almost surely, 2^1306320728 is an apocalyptic number.

It is an amenable number.

1306320728 is a deficient number, since it is larger than the sum of its proper divisors (1168283152).

1306320728 is a wasteful number, since it uses less digits than its factorization.

1306320728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683506 (or 1683502 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 1306320728 is about 36143.0591953697. The cubic root of 1306320728 is about 1093.1588439400.

Adding to 1306320728 its reverse (8270236031), we get a palindrome (9576556759).

The spelling of 1306320728 in words is "one billion, three hundred six million, three hundred twenty thousand, seven hundred twenty-eight".