215515272 has 64 divisors (see below), whose sum is σ = 624228480. Its totient is φ = 60728832.

The previous prime is 215515247. The next prime is 215515291. The reversal of 215515272 is 272515512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3478 + ... + 21050.

It is an arithmetic number, because the mean of its divisors is an integer number (9753570).

Almost surely, 2^215515272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215515272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312114240).

215515272 is an abundant number, since it is smaller than the sum of its proper divisors (408713208).

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

215515272 is a wasteful number, since it uses less digits than its factorization.

215515272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17662 (or 17658 counting only the distinct ones).

The product of its digits is 7000, while the sum is 30.

The square root of 215515272 is about 14680.4384130720. The cubic root of 215515272 is about 599.5508416229.

The spelling of 215515272 in words is "two hundred fifteen million, five hundred fifteen thousand, two hundred seventy-two".