531481664 has 56 divisors (see below), whose sum is σ = 1220663040. Its totient is φ = 224879616.

The previous prime is 531481633. The next prime is 531481667. The reversal of 531481664 is 466184135.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (531481667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27884 + ... + 42900.

Almost surely, 2^531481664 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 531481664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (610331520).

531481664 is an abundant number, since it is smaller than the sum of its proper divisors (689181376).

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

531481664 is a wasteful number, since it uses less digits than its factorization.

531481664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15115 (or 15105 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 531481664 is about 23053.8860932382. The cubic root of 531481664 is about 810.0206589254.

The spelling of 531481664 in words is "five hundred thirty-one million, four hundred eighty-one thousand, six hundred sixty-four".