217283685388 has 48 divisors (see below), whose sum is σ = 494685402624. Its totient is φ = 80975283840.

The previous prime is 217283685373. The next prime is 217283685419. The reversal of 217283685388 is 883586382712.

217283685388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15329145 + ... + 15343312.

It is an arithmetic number, because the mean of its divisors is an integer number (10305945888).

Almost surely, 2^217283685388 is an apocalyptic number.

217283685388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

217283685388 is an abundant number, since it is smaller than the sum of its proper divisors (277401717236).

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

217283685388 is a wasteful number, since it uses less digits than its factorization.

217283685388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30672502 (or 30672500 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 61.

The spelling of 217283685388 in words is "two hundred seventeen billion, two hundred eighty-three million, six hundred eighty-five thousand, three hundred eighty-eight".