720516 has 24 divisors (see below), whose sum is σ = 1701280. Its totient is φ = 237312.

The previous prime is 720497. The next prime is 720527. The reversal of 720516 is 615027.

It is a junction number, because it is equal to n+sod(n) for n = 720492 and 720501.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720516.

It is an unprimeable number.

720516 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855 + ... + 1473.

2⁷²⁰⁵¹⁶ is an apocalyptic number.

It is an amenable number.

720516 is an abundant number, since it is smaller than the sum of its proper divisors (980764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720516 is a wasteful number, since it uses less digits than its factorization.

720516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 720516 is about 848.8321388826. The cubic root of 720516 is about 89.6495009743.

The spelling of 720516 in words is "seven hundred twenty thousand, five hundred sixteen".