724401540 has 72 divisors (see below), whose sum is σ = 2256759960. Its totient is φ = 187951104.

The previous prime is 724401499. The next prime is 724401563. The reversal of 724401540 is 45104427.

724401540 is a `hidden beast` number, since 72 + 440 + 154 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 174874176 + 549527364 = 13224^2 + 23442^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47725 + ... + 61044.

Almost surely, 2^724401540 is an apocalyptic number.

It is an amenable number.

724401540 is an abundant number, since it is smaller than the sum of its proper divisors (1532358420).

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

724401540 is a wasteful number, since it uses less digits than its factorization.

724401540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108821 (or 108816 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 724401540 is about 26914.7086181515. The cubic root of 724401540 is about 898.1036366651.

Adding to 724401540 its reverse (45104427), we get a palindrome (769505967).

The spelling of 724401540 in words is "seven hundred twenty-four million, four hundred one thousand, five hundred forty".