720663 has 8 divisors (see below), whose sum is σ = 966000. Its totient is φ = 477888.

The previous prime is 720661. The next prime is 720677. The reversal of 720663 is 366027.

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

It is not a de Polignac number, because 720663 - 2¹ = 720661 is a prime.

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 720663.

It is not an unprimeable number, because it can be changed into a prime (720661) 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, 163 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (120750).

2⁷²⁰⁶⁶³ is an apocalyptic number.

720663 is a deficient number, since it is larger than the sum of its proper divisors (245337).

720663 is a wasteful number, since it uses less digits than its factorization.

720663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 720663 is about 848.9187240249. The cubic root of 720663 is about 89.6555973370.

The spelling of 720663 in words is "seven hundred twenty thousand, six hundred sixty-three".