215540208 has 120 divisors (see below), whose sum is σ = 656864208. Its totient is φ = 65581056.

The previous prime is 215540191. The next prime is 215540219. The reversal of 215540208 is 802045512.

It is a happy number.

215540208 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180991 + ... + 182177.

Almost surely, 2^215540208 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 215540208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328432104).

215540208 is an abundant number, since it is smaller than the sum of its proper divisors (441324000).

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

215540208 is a wasteful number, since it uses less digits than its factorization.

215540208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 215540208 is about 14681.2876819440. The cubic root of 215540208 is about 599.5739642275.

The spelling of 215540208 in words is "two hundred fifteen million, five hundred forty thousand, two hundred eight".