1320705628 has 48 divisors (see below), whose sum is σ = 2560763520. Its totient is φ = 590990400.

The previous prime is 1320705623. The next prime is 1320705629. The reversal of 1320705628 is 8265070231.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1320705593 and 1320705602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320705623) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1537063 + ... + 1537921.

It is an arithmetic number, because the mean of its divisors is an integer number (53349240).

Almost surely, 2^1320705628 is an apocalyptic number.

It is an amenable number.

1320705628 is a deficient number, since it is larger than the sum of its proper divisors (1240057892).

1320705628 is a wasteful number, since it uses less digits than its factorization.

1320705628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378 (or 1376 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1320705628 is about 36341.5138374834. The cubic root of 1320705628 is about 1097.1567419840.

Adding to 1320705628 its reverse (8265070231), we get a palindrome (9585775859).

The spelling of 1320705628 in words is "one billion, three hundred twenty million, seven hundred five thousand, six hundred twenty-eight".