720040 has 32 divisors (see below), whose sum is σ = 1658880. Its totient is φ = 281152.

The previous prime is 720023. The next prime is 720053. The reversal of 720040 is 40027.

It is a self number, because there is not a number n which added to its sum of digits gives 720040.

It is an unprimeable 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, 1689 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁷²⁰⁰⁴⁰ 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 720040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829440).

720040 is an abundant number, since it is smaller than the sum of its proper divisors (938840).

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

720040 is a wasteful number, since it uses less digits than its factorization.

720040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 13.

The square root of 720040 is about 848.5517073225. The cubic root of 720040 is about 89.6297546799.

Subtracting from 720040 its sum of digits (13), we obtain a palindrome (720027).

Adding to 720040 its reverse (40027), we get a palindrome (760067).

The spelling of 720040 in words is "seven hundred twenty thousand, forty", and thus it is an iban number.