720331387 has 2 divisors, whose sum is σ = 720331388. Its totient is φ = 720331386.

The previous prime is 720331357. The next prime is 720331397. The reversal of 720331387 is 783133027.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720331387 is a prime.

It is not a weakly prime, because it can be changed into another prime (720331307) 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 as a sum of consecutive naturals, namely, 360165693 + 360165694.

It is an arithmetic number, because the mean of its divisors is an integer number (360165694).

Almost surely, 2^720331387 is an apocalyptic number.

720331387 is a deficient number, since it is larger than the sum of its proper divisors (1).

720331387 is an equidigital number, since it uses as much as digits as its factorization.

720331387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 720331387 is about 26838.9900517885. The cubic root of 720331387 is about 896.4184355607.

The spelling of 720331387 in words is "seven hundred twenty million, three hundred thirty-one thousand, three hundred eighty-seven".