215716128 has 96 divisors (see below), whose sum is σ = 604739520. Its totient is φ = 67092480.

The previous prime is 215716121. The next prime is 215716159. The reversal of 215716128 is 821617512.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (215716121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213288 + ... + 214296.

It is an arithmetic number, because the mean of its divisors is an integer number (6299370).

Almost surely, 2^215716128 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 215716128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302369760).

215716128 is an abundant number, since it is smaller than the sum of its proper divisors (389023392).

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

215716128 is a wasteful number, since it uses less digits than its factorization.

215716128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1162 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 215716128 is about 14687.2777600207. The cubic root of 215716128 is about 599.7370403261.

The spelling of 215716128 in words is "two hundred fifteen million, seven hundred sixteen thousand, one hundred twenty-eight".