215880 has 64 divisors (see below), whose sum is σ = 743040. Its totient is φ = 49152.

The previous prime is 215863. The next prime is 215893. The reversal of 215880 is 88512.

215880 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 215880.

It is a congruent number.

It is an unprimeable number.

215880 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 15 ways as a sum of consecutive naturals, for example, 712 + ... + 968.

It is an arithmetic number, because the mean of its divisors is an integer number (11610).

2²¹⁵⁸⁸⁰ is an apocalyptic number.

215880 is a gapful number since it is divisible by the number (20) 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 215880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371520).

215880 is an abundant number, since it is smaller than the sum of its proper divisors (527160).

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

215880 is a wasteful number, since it uses less digits than its factorization.

215880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 274 counting only the distinct ones).

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

The square root of 215880 is about 464.6288841646. The cubic root of 215880 is about 59.9888868306.

The spelling of 215880 in words is "two hundred fifteen thousand, eight hundred eighty".