215616 has 28 divisors (see below), whose sum is σ = 570992. Its totient is φ = 71808.

The previous prime is 215587. The next prime is 215617. The reversal of 215616 is 616512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 215592 and 215601.

It is not an unprimeable number, because it can be changed into a prime (215617) by changing a digit.

215616 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 3 ways as a sum of consecutive naturals, for example, 370 + ... + 753.

2²¹⁵⁶¹⁶ is an apocalyptic number.

It is an amenable number.

215616 is an abundant number, since it is smaller than the sum of its proper divisors (355376).

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

215616 is a wasteful number, since it uses less digits than its factorization.

215616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1128 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 215616 is about 464.3446995498. The cubic root of 215616 is about 59.9644233537.

The spelling of 215616 in words is "two hundred fifteen thousand, six hundred sixteen".