538844643820 has 24 divisors (see below), whose sum is σ = 1293227145504. Its totient is φ = 184746734976.

The previous prime is 538844643817. The next prime is 538844643833. The reversal of 538844643820 is 28346448835.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1924445017 + ... + 1924445296.

It is an arithmetic number, because the mean of its divisors is an integer number (53884464396).

Almost surely, 2^538844643820 is an apocalyptic number.

It is an amenable number.

538844643820 is an abundant number, since it is smaller than the sum of its proper divisors (754382501684).

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

538844643820 is a wasteful number, since it uses less digits than its factorization.

538844643820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3848890329 (or 3848890327 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 55.

The spelling of 538844643820 in words is "five hundred thirty-eight billion, eight hundred forty-four million, six hundred forty-three thousand, eight hundred twenty".