1310728 has 8 divisors (see below), whose sum is σ = 2457630. Its totient is φ = 655360.

The previous prime is 1310723. The next prime is 1310741. The reversal of 1310728 is 8270131.

It can be written as a sum of positive squares in only one way, i.e., 736164 + 574564 = 858^2 + 758^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1310699 and 1310708.

It is not an unprimeable number, because it can be changed into a prime (1310723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81913 + ... + 81928.

2^1310728 is an apocalyptic number.

It is an amenable number.

1310728 is a deficient number, since it is larger than the sum of its proper divisors (1146902).

1310728 is a wasteful number, since it uses less digits than its factorization.

1310728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163847 (or 163843 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1310728 is about 1144.8702983308. The cubic root of 1310728 is about 109.4386832400.

Adding to 1310728 its reverse (8270131), we get a palindrome (9580859).

It can be divided in two parts, 131072 and 8, that multiplied together give a 20-th power (1048576 = 2²⁰).

The spelling of 1310728 in words is "one million, three hundred ten thousand, seven hundred twenty-eight".