217327881828 has 48 divisors (see below), whose sum is σ = 513035550720. Its totient is φ = 71598802464.

The previous prime is 217327881817. The next prime is 217327881853. The reversal of 217327881828 is 828188723712.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129703 + ... + 671921.

It is an arithmetic number, because the mean of its divisors is an integer number (10688240640).

Almost surely, 2^217327881828 is an apocalyptic number.

It is an amenable number.

217327881828 is an abundant number, since it is smaller than the sum of its proper divisors (295707668892).

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

217327881828 is a wasteful number, since it uses less digits than its factorization.

217327881828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542616 (or 542614 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 57.

The spelling of 217327881828 in words is "two hundred seventeen billion, three hundred twenty-seven million, eight hundred eighty-one thousand, eight hundred twenty-eight".