724540 has 24 divisors (see below), whose sum is σ = 1611792. Its totient is φ = 272640.

The previous prime is 724531. The next prime is 724547. The reversal of 724540 is 45427.

724540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724547) 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, 726 + ... + 1405.

It is an arithmetic number, because the mean of its divisors is an integer number (67158).

2⁷²⁴⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

724540 is an abundant number, since it is smaller than the sum of its proper divisors (887252).

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

724540 is a wasteful number, since it uses less digits than its factorization.

724540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157 (or 2155 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 724540 is about 851.1991541349. The cubic root of 724540 is about 89.8160853324.

Adding to 724540 its reverse (45427), we get a palindrome (769967).

The spelling of 724540 in words is "seven hundred twenty-four thousand, five hundred forty".