720684 has 24 divisors (see below), whose sum is σ = 1868720. Its totient is φ = 240192.

The previous prime is 720683. The next prime is 720697. The reversal of 720684 is 486027.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (720683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3229 + ... + 3444.

2⁷²⁰⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

720684 is an abundant number, since it is smaller than the sum of its proper divisors (1148036).

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

720684 is a wasteful number, since it uses less digits than its factorization.

720684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6686 (or 6678 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 720684 is about 848.9310926100. The cubic root of 720684 is about 89.6564681782.

The spelling of 720684 in words is "seven hundred twenty thousand, six hundred eighty-four".