161880000 has 280 divisors, whose sum is σ = 571317120. Its totient is φ = 40320000.

The previous prime is 161879999. The next prime is 161880023. The reversal of 161880000 is 88161.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2279965 + ... + 2280035.

Almost surely, 2^161880000 is an apocalyptic number.

161880000 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 161880000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285658560).

161880000 is an abundant number, since it is smaller than the sum of its proper divisors (409437120).

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

161880000 is an equidigital number, since it uses as much as digits as its factorization.

161880000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 161880000 is about 12723.2071428551. The cubic root of 161880000 is about 545.0015430756.

It can be divided in two parts, 1618 and 80000, that added together give a palindrome (81618).

The spelling of 161880000 in words is "one hundred sixty-one million, eight hundred eighty thousand".