161800860 has 192 divisors, whose sum is σ = 528353280. Its totient is φ = 36664320.

The previous prime is 161800841. The next prime is 161800861. The reversal of 161800860 is 68008161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161800861) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 520105 + ... + 520415.

It is an arithmetic number, because the mean of its divisors is an integer number (2751840).

Almost surely, 2^161800860 is an apocalyptic number.

161800860 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 161800860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264176640).

161800860 is an abundant number, since it is smaller than the sum of its proper divisors (366552420).

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

161800860 is a wasteful number, since it uses less digits than its factorization.

161800860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 161800860 is about 12720.0966977457. The cubic root of 161800860 is about 544.9127150286.

The spelling of 161800860 in words is "one hundred sixty-one million, eight hundred thousand, eight hundred sixty".