120728813 has 2 divisors, whose sum is σ = 120728814. Its totient is φ = 120728812.

The previous prime is 120728807. The next prime is 120728833. The reversal of 120728813 is 318827021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77668969 + 43059844 = 8813^2 + 6562^2 .

It is an emirp because it is prime and its reverse (318827021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120728813 - 2⁶ = 120728749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120728813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120728833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60364406 + 60364407.

It is an arithmetic number, because the mean of its divisors is an integer number (60364407).

Almost surely, 2^120728813 is an apocalyptic number.

It is an amenable number.

120728813 is a deficient number, since it is larger than the sum of its proper divisors (1).

120728813 is an equidigital number, since it uses as much as digits as its factorization.

120728813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 120728813 is about 10987.6664037456. Note that the first 3 decimals coincide. The cubic root of 120728813 is about 494.2389597730.

The spelling of 120728813 in words is "one hundred twenty million, seven hundred twenty-eight thousand, eight hundred thirteen".