720912 has 40 divisors (see below), whose sum is σ = 1946304. Its totient is φ = 229504.

The previous prime is 720901. The next prime is 720913. The reversal of 720912 is 219027.

It is a happy number.

It is a super-2 number, since 2×720912² = 1039428223488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (720913) by changing a digit.

720912 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 7 ways as a sum of consecutive naturals, for example, 778 + ... + 1430.

2⁷²⁰⁹¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973152).

720912 is an abundant number, since it is smaller than the sum of its proper divisors (1225392).

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

720912 is a wasteful number, since it uses less digits than its factorization.

720912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 681 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 720912 is about 849.0653685082. The cubic root of 720912 is about 89.6659219376.

Adding to 720912 its reverse (219027), we get a palindrome (939939).

The spelling of 720912 in words is "seven hundred twenty thousand, nine hundred twelve".