217430280 has 96 divisors (see below), whose sum is σ = 729480960. Its totient is φ = 56108160.

The previous prime is 217430267. The next prime is 217430287. The reversal of 217430280 is 82034712.

217430280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (217430287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1419 + ... + 20901.

It is an arithmetic number, because the mean of its divisors is an integer number (7598760).

Almost surely, 2^217430280 is an apocalyptic number.

217430280 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 217430280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364740480).

217430280 is an abundant number, since it is smaller than the sum of its proper divisors (512050680).

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

217430280 is a wasteful number, since it uses less digits than its factorization.

217430280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19531 (or 19524 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 217430280 is about 14745.5172849243. The cubic root of 217430280 is about 601.3214209413.

Adding to 217430280 its reverse (82034712), we get a palindrome (299464992).

The spelling of 217430280 in words is "two hundred seventeen million, four hundred thirty thousand, two hundred eighty".