161803880 has 96 divisors (see below), whose sum is σ = 437322240. Its totient is φ = 53665920.

The previous prime is 161803823. The next prime is 161803897. The reversal of 161803880 is 88308161.

It is a happy number.

161803880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 161803880.

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, 59429 + ... + 62091.

It is an arithmetic number, because the mean of its divisors is an integer number (4555440).

Almost surely, 2^161803880 is an apocalyptic number.

161803880 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 161803880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218661120).

161803880 is an abundant number, since it is smaller than the sum of its proper divisors (275518360).

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

161803880 is a wasteful number, since it uses less digits than its factorization.

161803880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719 (or 2708 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 161803880 is about 12720.2154069811. The cubic root of 161803880 is about 544.9161052582.

The spelling of 161803880 in words is "one hundred sixty-one million, eight hundred three thousand, eight hundred eighty".