215696 has 40 divisors (see below), whose sum is σ = 484344. Its totient is φ = 92160.

The previous prime is 215693. The next prime is 215723. The reversal of 215696 is 696512.

It can be written as a sum of positive squares in 4 ways, for example, as 400 + 215296 = 20^2 + 464^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (215693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3506 + ... + 3566.

2²¹⁵⁶⁹⁶ is an apocalyptic number.

215696 is a gapful number since it is divisible by the number (26) 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 215696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242172).

215696 is an abundant number, since it is smaller than the sum of its proper divisors (268648).

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

215696 is a wasteful number, since it uses less digits than its factorization.

215696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 93 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 215696 is about 464.4308344630. The cubic root of 215696 is about 59.9718386362.

The spelling of 215696 in words is "two hundred fifteen thousand, six hundred ninety-six".