720240 has 40 divisors (see below), whose sum is σ = 2233488. Its totient is φ = 192000.

The previous prime is 720229. The next prime is 720241. The reversal of 720240 is 42027.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261 + ... + 1740.

2⁷²⁰²⁴⁰ is an apocalyptic number.

It is an amenable number.

720240 is an abundant number, since it is smaller than the sum of its proper divisors (1513248).

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

720240 is a wasteful number, since it uses less digits than its factorization.

720240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3017 (or 3011 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 720240 is about 848.6695469969. The cubic root of 720240 is about 89.6380525020.

Adding to 720240 its reverse (42027), we get a palindrome (762267).

The spelling of 720240 in words is "seven hundred twenty thousand, two hundred forty", and thus it is an iban number.