215680 has 32 divisors (see below), whose sum is σ = 517140. Its totient is φ = 86016.

The previous prime is 215659. The next prime is 215681. The reversal of 215680 is 86512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 207936 + 7744 = 456^2 + 88^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (215681) 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, 472 + ... + 808.

2²¹⁵⁶⁸⁰ is an apocalyptic number.

215680 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 215680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258570).

215680 is an abundant number, since it is smaller than the sum of its proper divisors (301460).

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

215680 is an equidigital number, since it uses as much as digits as its factorization.

215680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 215680 is about 464.4136087584. The cubic root of 215680 is about 59.9703557264.

The spelling of 215680 in words is "two hundred fifteen thousand, six hundred eighty".