161688 has 16 divisors (see below), whose sum is σ = 404280. Its totient is φ = 53888.

The previous prime is 161683. The next prime is 161717. The reversal of 161688 is 886161.

It is a super-2 number, since 2×161688² = 52286018688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161683) 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, 3345 + ... + 3392.

2¹⁶¹⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

161688 is an abundant number, since it is smaller than the sum of its proper divisors (242592).

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

161688 is a wasteful number, since it uses less digits than its factorization.

161688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6746 (or 6742 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 161688 is about 402.1044640389. The cubic root of 161688 is about 54.4785988975.

The spelling of 161688 in words is "one hundred sixty-one thousand, six hundred eighty-eight".