215530224 has 320 divisors, whose sum is σ = 749952000. Its totient is φ = 52835328.

The previous prime is 215530213. The next prime is 215530247. The reversal of 215530224 is 422035512.

It is a super-3 number, since 3×215530224³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 215530194 and 215530203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4066582 + ... + 4066634.

It is an arithmetic number, because the mean of its divisors is an integer number (2343600).

Almost surely, 2^215530224 is an apocalyptic number.

215530224 is a gapful number since it is divisible by the number (24) 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 215530224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374976000).

215530224 is an abundant number, since it is smaller than the sum of its proper divisors (534421776).

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

215530224 is a wasteful number, since it uses less digits than its factorization.

215530224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 215530224 is about 14680.9476533363. The cubic root of 215530224 is about 599.5647064979.

Adding to 215530224 its reverse (422035512), we get a palindrome (637565736).

The spelling of 215530224 in words is "two hundred fifteen million, five hundred thirty thousand, two hundred twenty-four".