215568 has 40 divisors (see below), whose sum is σ = 620000. Its totient is φ = 71712.

The previous prime is 215563. The next prime is 215573. The reversal of 215568 is 865512.

It is an interprime number because it is at equal distance from previous prime (215563) and next prime (215573).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (215563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183 + ... + 681.

It is an arithmetic number, because the mean of its divisors is an integer number (15500).

2²¹⁵⁵⁶⁸ 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 215568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310000).

215568 is an abundant number, since it is smaller than the sum of its proper divisors (404432).

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

215568 is a wasteful number, since it uses less digits than its factorization.

215568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 504 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 215568 is about 464.2930109317. The cubic root of 215568 is about 59.9599733037.

The spelling of 215568 in words is "two hundred fifteen thousand, five hundred sixty-eight".