720999 has 6 divisors (see below), whose sum is σ = 1041456. Its totient is φ = 480660.

The previous prime is 720997. The next prime is 721003. The reversal of 720999 is 999027.

It is not a de Polignac number, because 720999 - 2¹ = 720997 is a prime.

720999 is a modest number, since divided by 999 gives 720 as remainder.

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 720999.

It is not an unprimeable number, because it can be changed into a prime (720991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40047 + ... + 40064.

It is an arithmetic number, because the mean of its divisors is an integer number (173576).

2⁷²⁰⁹⁹⁹ is an apocalyptic number.

720999 is a deficient number, since it is larger than the sum of its proper divisors (320457).

720999 is a wasteful number, since it uses less digits than its factorization.

720999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80117 (or 80114 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 720999 is about 849.1165997671. The cubic root of 720999 is about 89.6695287678.

The spelling of 720999 in words is "seven hundred twenty thousand, nine hundred ninety-nine".