720740217 has 8 divisors (see below), whose sum is σ = 962765440. Its totient is φ = 479604240.

The previous prime is 720740203. The next prime is 720740227. The reversal of 720740217 is 712047027.

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

It is not a de Polignac number, because 720740217 - 2⁴ = 720740201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720740227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220417 + ... + 223662.

It is an arithmetic number, because the mean of its divisors is an integer number (120345680).

Almost surely, 2^720740217 is an apocalyptic number.

It is an amenable number.

720740217 is a deficient number, since it is larger than the sum of its proper divisors (242025223).

720740217 is a wasteful number, since it uses less digits than its factorization.

720740217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444623.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 720740217 is about 26846.6053161289. The cubic root of 720740217 is about 896.5879933707.

The spelling of 720740217 in words is "seven hundred twenty million, seven hundred forty thousand, two hundred seventeen".