531440660 has 48 divisors (see below), whose sum is σ = 1157587200. Its totient is φ = 204699264.

The previous prime is 531440653. The next prime is 531440677. The reversal of 531440660 is 66044135.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

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, 267551 + ... + 269529.

It is an arithmetic number, because the mean of its divisors is an integer number (24116400).

Almost surely, 2^531440660 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 531440660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (578793600).

531440660 is an abundant number, since it is smaller than the sum of its proper divisors (626146540).

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

531440660 is a wasteful number, since it uses less digits than its factorization.

531440660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480 (or 2478 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 531440660 is about 23052.9967683163. The cubic root of 531440660 is about 809.9998272621. Note that the first 3 decimals are identical.

Adding to 531440660 its reverse (66044135), we get a palindrome (597484795).

The spelling of 531440660 in words is "five hundred thirty-one million, four hundred forty thousand, six hundred sixty".