161688084 has 96 divisors (see below), whose sum is σ = 404490240. Its totient is φ = 50201088.

The previous prime is 161688083. The next prime is 161688101. The reversal of 161688084 is 480886161.

It is a super-2 number, since 2×161688084² = 52286073015182112, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161688083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1430812 + ... + 1430924.

It is an arithmetic number, because the mean of its divisors is an integer number (4213440).

Almost surely, 2^161688084 is an apocalyptic number.

It is an amenable number.

161688084 is an abundant number, since it is smaller than the sum of its proper divisors (242802156).

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

161688084 is a wasteful number, since it uses less digits than its factorization.

161688084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 161688084 is about 12715.6629398549. The cubic root of 161688084 is about 544.7860833169.

The spelling of 161688084 in words is "one hundred sixty-one million, six hundred eighty-eight thousand, eighty-four".