217030380 has 192 divisors, whose sum is σ = 729415680. Its totient is φ = 47174400.

The previous prime is 217030357. The next prime is 217030409. The reversal of 217030380 is 83030712.

It is a self number, because there is not a number n which added to its sum of digits gives 217030380.

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 63 ways as a sum of consecutive naturals, for example, 1028475 + ... + 1028685.

It is an arithmetic number, because the mean of its divisors is an integer number (3799040).

Almost surely, 2^217030380 is an apocalyptic number.

217030380 is a gapful number since it is divisible by the number (20) 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 217030380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364707840).

217030380 is an abundant number, since it is smaller than the sum of its proper divisors (512385300).

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

217030380 is a wasteful number, since it uses less digits than its factorization.

217030380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 217030380 is about 14731.9509909584. The cubic root of 217030380 is about 600.9525425265.

The spelling of 217030380 in words is "two hundred seventeen million, thirty thousand, three hundred eighty".