538481664 has 264 divisors, whose sum is σ = 1885336128. Its totient is φ = 144506880.

The previous prime is 538481663. The next prime is 538481677. The reversal of 538481664 is 466184835.

538481664 is a `hidden beast` number, since 538 + 48 + 16 + 64 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538481663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1096459 + ... + 1096949.

Almost surely, 2^538481664 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 538481664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942668064).

538481664 is an abundant number, since it is smaller than the sum of its proper divisors (1346854464).

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

538481664 is a wasteful number, since it uses less digits than its factorization.

538481664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 520 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 538481664 is about 23205.2076913782. The cubic root of 538481664 is about 813.5613466842.

The spelling of 538481664 in words is "five hundred thirty-eight million, four hundred eighty-one thousand, six hundred sixty-four".