531187780 has 72 divisors (see below), whose sum is σ = 1226219400. Its totient is φ = 193019904.

The previous prime is 531187753. The next prime is 531187781. The reversal of 531187780 is 87781135.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 254016 + 530933764 = 504^2 + 23042^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531187781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166036 + ... + 169204.

It is an arithmetic number, because the mean of its divisors is an integer number (17030825).

Almost surely, 2^531187780 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 531187780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (613109700).

531187780 is an abundant number, since it is smaller than the sum of its proper divisors (695031620).

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

531187780 is a wasteful number, since it uses less digits than its factorization.

531187780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241 (or 3222 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 40.

The square root of 531187780 is about 23047.5113624009. The cubic root of 531187780 is about 809.8713304737.

The spelling of 531187780 in words is "five hundred thirty-one million, one hundred eighty-seven thousand, seven hundred eighty".