531800640 has 336 divisors, whose sum is σ = 2170127232. Its totient is φ = 121430016.

The previous prime is 531800611. The next prime is 531800677. The reversal of 531800640 is 46008135.

531800640 is a `hidden beast` number, since 5 + 3 + 18 + 0 + 0 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 543832 + ... + 544808.

It is an arithmetic number, because the mean of its divisors is an integer number (6458712).

Almost surely, 2^531800640 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 531800640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1085063616).

531800640 is an abundant number, since it is smaller than the sum of its proper divisors (1638326592).

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

531800640 is an equidigital number, since it uses as much as digits as its factorization.

531800640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 531800640 is about 23060.8031083048. The cubic root of 531800640 is about 810.1826748486.

Adding to 531800640 its reverse (46008135), we get a palindrome (577808775).

The spelling of 531800640 in words is "five hundred thirty-one million, eight hundred thousand, six hundred forty".