720805003 has 4 divisors (see below), whose sum is σ = 720966400. Its totient is φ = 720643608.

The previous prime is 720804979. The next prime is 720805031. The reversal of 720805003 is 300508027.

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 720805003 - 2¹⁷ = 720673931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720805093) 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 3 ways as a sum of consecutive naturals, for example, 73803 + ... + 82996.

It is an arithmetic number, because the mean of its divisors is an integer number (180241600).

Almost surely, 2^720805003 is an apocalyptic number.

720805003 is a deficient number, since it is larger than the sum of its proper divisors (161397).

720805003 is a wasteful number, since it uses less digits than its factorization.

720805003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161396.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 720805003 is about 26847.8118847701. The cubic root of 720805003 is about 896.6148567759.

The spelling of 720805003 in words is "seven hundred twenty million, eight hundred five thousand, three".