720745 has 8 divisors (see below), whose sum is σ = 883584. Its totient is φ = 564144.

The previous prime is 720743. The next prime is 720763. The reversal of 720745 is 547027.

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

It is a cyclic number.

It is not a de Polignac number, because 720745 - 2¹ = 720743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720743) 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, 1299 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (110448).

2⁷²⁰⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

720745 is a deficient number, since it is larger than the sum of its proper divisors (162839).

720745 is a wasteful number, since it uses less digits than its factorization.

720745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 720745 is about 848.9670193830. The cubic root of 720745 is about 89.6589976689.

The spelling of 720745 in words is "seven hundred twenty thousand, seven hundred forty-five".