217478874712 has 48 divisors (see below), whose sum is σ = 448749075600. Its totient is φ = 98735841600.

The previous prime is 217478874709. The next prime is 217478874797.

217478874712 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 678262 + ... + 946042.

It is an arithmetic number, because the mean of its divisors is an integer number (9348939075).

Almost surely, 2^217478874712 is an apocalyptic number.

217478874712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217478874712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224374537800).

217478874712 is an abundant number, since it is smaller than the sum of its proper divisors (231270200888).

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

217478874712 is a wasteful number, since it uses less digits than its factorization.

217478874712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268648 (or 268633 counting only the distinct ones).

The product of its digits is 9834496, while the sum is 58.

The spelling of 217478874712 in words is "two hundred seventeen billion, four hundred seventy-eight million, eight hundred seventy-four thousand, seven hundred twelve".