215808 has 36 divisors (see below), whose sum is σ = 576408. Its totient is φ = 71680.

The previous prime is 215801. The next prime is 215827. The reversal of 215808 is 808512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 215808.

It is not an unprimeable number, because it can be changed into a prime (215801) by changing a digit.

215808 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628 + ... + 908.

2²¹⁵⁸⁰⁸ 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 215808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288204).

215808 is an abundant number, since it is smaller than the sum of its proper divisors (360600).

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

215808 is an equidigital number, since it uses as much as digits as its factorization.

215808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 215808 is about 464.5513965107. The cubic root of 215808 is about 59.9822169521.

Subtracting 215808 from its reverse (808512), we obtain a cube (592704 = 84³).

The spelling of 215808 in words is "two hundred fifteen thousand, eight hundred eight".