215728912 has 80 divisors (see below), whose sum is σ = 523359360. Its totient is φ = 83994624.

The previous prime is 215728901. The next prime is 215728927. The reversal of 215728912 is 219827512.

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 15 ways as a sum of consecutive naturals, for example, 53263 + ... + 57169.

It is an arithmetic number, because the mean of its divisors is an integer number (6541992).

Almost surely, 2^215728912 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 215728912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261679680).

215728912 is an abundant number, since it is smaller than the sum of its proper divisors (307630448).

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

215728912 is a wasteful number, since it uses less digits than its factorization.

215728912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968 (or 3962 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 215728912 is about 14687.7129601582. The cubic root of 215728912 is about 599.7488875115.

The spelling of 215728912 in words is "two hundred fifteen million, seven hundred twenty-eight thousand, nine hundred twelve".