720720845 has 16 divisors (see below), whose sum is σ = 932238720. Its totient is φ = 531741504.

The previous prime is 720720811. The next prime is 720720857. The reversal of 720720845 is 548027027.

It is a cyclic number.

It is not a de Polignac number, because 720720845 - 2¹⁰ = 720719821 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77432 + ... + 86238.

It is an arithmetic number, because the mean of its divisors is an integer number (58264920).

Almost surely, 2^720720845 is an apocalyptic number.

It is an amenable number.

720720845 is a deficient number, since it is larger than the sum of its proper divisors (211517875).

720720845 is a wasteful number, since it uses less digits than its factorization.

720720845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10084.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 720720845 is about 26846.2445232103. The cubic root of 720720845 is about 896.5799604911.

The spelling of 720720845 in words is "seven hundred twenty million, seven hundred twenty thousand, eight hundred forty-five".