720718 has 8 divisors (see below), whose sum is σ = 1087848. Its totient is φ = 358104.

The previous prime is 720703. The next prime is 720743. The reversal of 720718 is 817027.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 720692 and 720701.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720718.

It is an unprimeable number.

720718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696 + ... + 1387.

It is an arithmetic number, because the mean of its divisors is an integer number (135981).

2⁷²⁰⁷¹⁸ is an apocalyptic number.

720718 is a deficient number, since it is larger than the sum of its proper divisors (367130).

720718 is a wasteful number, since it uses less digits than its factorization.

720718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 720718 is about 848.9511175562. The cubic root of 720718 is about 89.6578780759.

It can be divided in two parts, 7207 and 18, that added together give a square (7225 = 85²).

The spelling of 720718 in words is "seven hundred twenty thousand, seven hundred eighteen".