720318307 has 4 divisors (see below), whose sum is σ = 721196496. Its totient is φ = 719440120.

The previous prime is 720318293. The next prime is 720318323. The reversal of 720318307 is 703813027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720318307 - 2¹⁵ = 720285539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720318337) 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 in 3 ways as a sum of consecutive naturals, for example, 437863 + ... + 439504.

It is an arithmetic number, because the mean of its divisors is an integer number (180299124).

Almost surely, 2^720318307 is an apocalyptic number.

720318307 is a deficient number, since it is larger than the sum of its proper divisors (878189).

720318307 is an equidigital number, since it uses as much as digits as its factorization.

720318307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878188.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 720318307 is about 26838.7463753432. The cubic root of 720318307 is about 896.4130097135.

The spelling of 720318307 in words is "seven hundred twenty million, three hundred eighteen thousand, three hundred seven".