531640000 has 70 divisors (see below), whose sum is σ = 1318393604. Its totient is φ = 212640000.

The previous prime is 531639971. The next prime is 531640019. The reversal of 531640000 is 46135.

It is a self number, because there is not a number n which added to its sum of digits gives 531640000.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33355 + ... + 46645.

Almost surely, 2^531640000 is an apocalyptic number.

531640000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659196802).

531640000 is an abundant number, since it is smaller than the sum of its proper divisors (786753604).

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

531640000 is an equidigital number, since it uses as much as digits as its factorization.

531640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13323 (or 13298 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 531640000 is about 23057.3198789452. The cubic root of 531640000 is about 810.1010898574.

Adding to 531640000 its reverse (46135), we get a palindrome (531686135).

The spelling of 531640000 in words is "five hundred thirty-one million, six hundred forty thousand".