538666540 has 24 divisors (see below), whose sum is σ = 1167691392. Its totient is φ = 208515840.

The previous prime is 538666481. The next prime is 538666543. The reversal of 538666540 is 45666835.

It is not an unprimeable number, because it can be changed into a prime (538666543) 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, 433789 + ... + 435028.

It is an arithmetic number, because the mean of its divisors is an integer number (48653808).

Almost surely, 2^538666540 is an apocalyptic number.

It is an amenable number.

538666540 is an abundant number, since it is smaller than the sum of its proper divisors (629024852).

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

538666540 is a wasteful number, since it uses less digits than its factorization.

538666540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868857 (or 868855 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 538666540 is about 23209.1908519018. The cubic root of 538666540 is about 813.6544422452.

It can be divided in two parts, 53866 and 6540, that added together give a palindrome (60406).

The spelling of 538666540 in words is "five hundred thirty-eight million, six hundred sixty-six thousand, five hundred forty".