720217 has 8 divisors (see below), whose sum is σ = 746496. Its totient is φ = 694512.

The previous prime is 720211. The next prime is 720221. The reversal of 720217 is 712027.

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

It is not a de Polignac number, because 720217 - 2⁷ = 720089 is a prime.

It is a Duffinian number.

720217 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 720194 and 720203.

It is not an unprimeable number, because it can be changed into a prime (720211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5608 + ... + 5734.

It is an arithmetic number, because the mean of its divisors is an integer number (93312).

2⁷²⁰²¹⁷ is an apocalyptic number.

It is an amenable number.

720217 is a deficient number, since it is larger than the sum of its proper divisors (26279).

720217 is a wasteful number, since it uses less digits than its factorization.

720217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 720217 is about 848.6559962670. The cubic root of 720217 is about 89.6370983307.

The spelling of 720217 in words is "seven hundred twenty thousand, two hundred seventeen", and thus it is an iban number.