531140240 has 80 divisors (see below), whose sum is σ = 1280918016. Its totient is φ = 204672000.

The previous prime is 531140221. The next prime is 531140251. The reversal of 531140240 is 42041135.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271265 + ... + 273215.

Almost surely, 2^531140240 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 531140240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (640459008).

531140240 is an abundant number, since it is smaller than the sum of its proper divisors (749777776).

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

531140240 is a wasteful number, since it uses less digits than its factorization.

531140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088 (or 2082 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 531140240 is about 23046.4799915302. The cubic root of 531140240 is about 809.8471692554.

Adding to 531140240 its reverse (42041135), we get a palindrome (573181375).

The spelling of 531140240 in words is "five hundred thirty-one million, one hundred forty thousand, two hundred forty".