720324 has 72 divisors (see below), whose sum is σ = 2122848. Its totient is φ = 203520.

The previous prime is 720319. The next prime is 720359. The reversal of 720324 is 423027.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

720324 is a modest number, since divided by 324 gives 72 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 720297 and 720306.

It is a congruent number.

It is an unprimeable number.

720324 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 23 ways as a sum of consecutive naturals, for example, 6679 + ... + 6785.

It is an arithmetic number, because the mean of its divisors is an integer number (29484).

2⁷²⁰³²⁴ 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 720324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061424).

720324 is an abundant number, since it is smaller than the sum of its proper divisors (1402524).

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

720324 is a wasteful number, since it uses less digits than its factorization.

720324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 720324 is about 848.7190347812. The cubic root of 720324 is about 89.6415371293.

It can be divided in two parts, 7203 and 24, that added together give a palindrome (7227).

The spelling of 720324 in words is "seven hundred twenty thousand, three hundred twenty-four", and thus it is an iban number.