217308183834 has 64 divisors (see below), whose sum is σ = 513428889600. Its totient is φ = 60002976960.

The previous prime is 217308183817. The next prime is 217308183839. The reversal of 217308183834 is 438381803712.

217308183834 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×217308183834² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217308183839) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 840517 + ... + 1068215.

It is an arithmetic number, because the mean of its divisors is an integer number (8022326400).

Almost surely, 2^217308183834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217308183834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256714444800).

217308183834 is an abundant number, since it is smaller than the sum of its proper divisors (296120705766).

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

217308183834 is a wasteful number, since it uses less digits than its factorization.

217308183834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228475.

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 217308183834 in words is "two hundred seventeen billion, three hundred eight million, one hundred eighty-three thousand, eight hundred thirty-four".