1320645736 has 16 divisors (see below), whose sum is σ = 2543135940. Its totient is φ = 642476160.

The previous prime is 1320645727. The next prime is 1320645751. The reversal of 1320645736 is 6375460231.

It can be written as a sum of positive squares in 2 ways, for example, as 1309716100 + 10929636 = 36190^2 + 3306^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 1320645695 and 1320645704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2230525 + ... + 2231116.

Almost surely, 2^1320645736 is an apocalyptic number.

It is an amenable number.

1320645736 is a deficient number, since it is larger than the sum of its proper divisors (1222490204).

1320645736 is a wasteful number, since it uses less digits than its factorization.

1320645736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4461684 (or 4461680 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 1320645736 is about 36340.6898118349. The cubic root of 1320645736 is about 1097.1401569344.

The spelling of 1320645736 in words is "one billion, three hundred twenty million, six hundred forty-five thousand, seven hundred thirty-six".