720305903 has 8 divisors (see below), whose sum is σ = 762760320. Its totient is φ = 678305880.

The previous prime is 720305893. The next prime is 720305909. The reversal of 720305903 is 309503027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720305903 - 2¹² = 720301807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720305909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110333 + ... + 116678.

It is an arithmetic number, because the mean of its divisors is an integer number (95345040).

Almost surely, 2^720305903 is an apocalyptic number.

720305903 is a deficient number, since it is larger than the sum of its proper divisors (42454417).

720305903 is a wasteful number, since it uses less digits than its factorization.

720305903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227197.

The product of its (nonzero) digits is 5670, while the sum is 29.

The square root of 720305903 is about 26838.5152905298. The cubic root of 720305903 is about 896.4078642240.

The spelling of 720305903 in words is "seven hundred twenty million, three hundred five thousand, nine hundred three".