724224 has 72 divisors (see below), whose sum is σ = 2060352. Its totient is φ = 225280.

The previous prime is 724219. The next prime is 724259. The reversal of 724224 is 422427.

It is a self number, because there is not a number n which added to its sum of digits gives 724224.

It is a congruent number.

It is an unprimeable number.

724224 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, 17644 + ... + 17684.

It is an arithmetic number, because the mean of its divisors is an integer number (28616).

2⁷²⁴²²⁴ 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 724224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030176).

724224 is an abundant number, since it is smaller than the sum of its proper divisors (1336128).

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

724224 is a wasteful number, since it uses less digits than its factorization.

724224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 69 counting only the distinct ones).

The product of its digits is 896, while the sum is 21.

The square root of 724224 is about 851.0135134062. The cubic root of 724224 is about 89.8030260074.

The spelling of 724224 in words is "seven hundred twenty-four thousand, two hundred twenty-four", and thus it is an iban number.