215315616 has 24 divisors (see below), whose sum is σ = 565203744. Its totient is φ = 71771840.

The previous prime is 215315599. The next prime is 215315621. The reversal of 215315616 is 616513512.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121340 + ... + 1121531.

It is an arithmetic number, because the mean of its divisors is an integer number (23550156).

Almost surely, 2^215315616 is an apocalyptic number.

It is an amenable number.

215315616 is an abundant number, since it is smaller than the sum of its proper divisors (349888128).

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

215315616 is a wasteful number, since it uses less digits than its factorization.

215315616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242884 (or 2242876 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 215315616 is about 14673.6367680272. The cubic root of 215315616 is about 599.3656406612.

The spelling of 215315616 in words is "two hundred fifteen million, three hundred fifteen thousand, six hundred sixteen".