215768 has 16 divisors (see below), whose sum is σ = 462480. Its totient is φ = 92448.

The previous prime is 215767. The next prime is 215771. The reversal of 215768 is 867512.

215768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 215768.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 215768.

It is not an unprimeable number, because it can be changed into a prime (215767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1871 + ... + 1982.

It is an arithmetic number, because the mean of its divisors is an integer number (28905).

2²¹⁵⁷⁶⁸ is an apocalyptic number.

215768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

215768 is an abundant number, since it is smaller than the sum of its proper divisors (246712).

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

215768 is a wasteful number, since it uses less digits than its factorization.

215768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866 (or 3862 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 215768 is about 464.5083422286. The cubic root of 215768 is about 59.9785108230.

The spelling of 215768 in words is "two hundred fifteen thousand, seven hundred sixty-eight".