215312328 has 192 divisors, whose sum is σ = 738616320. Its totient is φ = 55036800.

The previous prime is 215312323. The next prime is 215312381. The reversal of 215312328 is 823213512.

215312328 is a `hidden beast` number, since 21 + 5 + 312 + 328 = 666.

It is not an unprimeable number, because it can be changed into a prime (215312323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 393351 + ... + 393897.

It is an arithmetic number, because the mean of its divisors is an integer number (3846960).

Almost surely, 2^215312328 is an apocalyptic number.

215312328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215312328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (369308160).

215312328 is an abundant number, since it is smaller than the sum of its proper divisors (523303992).

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

215312328 is a wasteful number, since it uses less digits than its factorization.

215312328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 641 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 215312328 is about 14673.5247299345. The cubic root of 215312328 is about 599.3625897534.

The spelling of 215312328 in words is "two hundred fifteen million, three hundred twelve thousand, three hundred twenty-eight".