720717 has 8 divisors (see below), whose sum is σ = 973440. Its totient is φ = 474240.

The previous prime is 720703. The next prime is 720743. The reversal of 720717 is 717027.

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

It is not a de Polignac number, because 720717 - 2⁶ = 720653 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720767) 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, 1284 + ... + 1757.

It is an arithmetic number, because the mean of its divisors is an integer number (121680).

2⁷²⁰⁷¹⁷ is an apocalyptic number.

It is an amenable number.

720717 is a deficient number, since it is larger than the sum of its proper divisors (252723).

720717 is a wasteful number, since it uses less digits than its factorization.

720717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123.

The product of its (nonzero) digits is 686, while the sum is 24.

The square root of 720717 is about 848.9505285940. The cubic root of 720717 is about 89.6578366089.

The spelling of 720717 in words is "seven hundred twenty thousand, seven hundred seventeen", and thus it is an iban number.