161718840 has 96 divisors (see below), whose sum is σ = 528325200. Its totient is φ = 42900480.

The previous prime is 161718839. The next prime is 161718853. The reversal of 161718840 is 48817161.

161718840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 161718795 and 161718804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74896 + ... + 77024.

Almost surely, 2^161718840 is an apocalyptic number.

161718840 is a gapful number since it is divisible by the number (10) 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 161718840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264162600).

161718840 is an abundant number, since it is smaller than the sum of its proper divisors (366606360).

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

161718840 is a wasteful number, since it uses less digits than its factorization.

161718840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357 (or 2350 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 161718840 is about 12716.8722569663. The cubic root of 161718840 is about 544.8206238513.

The spelling of 161718840 in words is "one hundred sixty-one million, seven hundred eighteen thousand, eight hundred forty".