531815064 has 64 divisors (see below), whose sum is σ = 1463322240. Its totient is φ = 159720960.

The previous prime is 531815057. The next prime is 531815069. The reversal of 531815064 is 460518135.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531815069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20919 + ... + 38745.

It is an arithmetic number, because the mean of its divisors is an integer number (22864410).

Almost surely, 2^531815064 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 531815064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731661120).

531815064 is an abundant number, since it is smaller than the sum of its proper divisors (931507176).

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

531815064 is a wasteful number, since it uses less digits than its factorization.

531815064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17960 (or 17956 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 531815064 is about 23061.1158446420. The cubic root of 531815064 is about 810.1899996294.

The spelling of 531815064 in words is "five hundred thirty-one million, eight hundred fifteen thousand, sixty-four".