215748 has 36 divisors (see below), whose sum is σ = 588588. Its totient is φ = 66240.

The previous prime is 215737. The next prime is 215753. The reversal of 215748 is 847512.

It can be written as a sum of positive squares in 2 ways, for example, as 49284 + 166464 = 222^2 + 408^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 215748.

It is an unprimeable number.

215748 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 11 ways as a sum of consecutive naturals, for example, 238 + ... + 698.

2²¹⁵⁷⁴⁸ 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 215748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294294).

215748 is an abundant number, since it is smaller than the sum of its proper divisors (372840).

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

215748 is a wasteful number, since it uses less digits than its factorization.

215748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 479 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 215748 is about 464.4868135911. The cubic root of 215748 is about 59.9766575867.

The spelling of 215748 in words is "two hundred fifteen thousand, seven hundred forty-eight".