161688888 has 24 divisors (see below), whose sum is σ = 437907600. Its totient is φ = 53896272.

The previous prime is 161688869. The next prime is 161688911. The reversal of 161688888 is 888886161.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×161688888² = 52286593005353088, which contains 22 as substring.

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

161688888 is a modest number, since divided by 88888 gives 1616 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122768 + ... + 1122911.

It is an arithmetic number, because the mean of its divisors is an integer number (18246150).

Almost surely, 2^161688888 is an apocalyptic number.

161688888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161688888 is an abundant number, since it is smaller than the sum of its proper divisors (276218712).

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

161688888 is a wasteful number, since it uses less digits than its factorization.

161688888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245691 (or 2245684 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 54.

The square root of 161688888 is about 12715.6945543686. The cubic root of 161688888 is about 544.7869863051.

The spelling of 161688888 in words is "one hundred sixty-one million, six hundred eighty-eight thousand, eight hundred eighty-eight".