161808224 has 24 divisors (see below), whose sum is σ = 319084920. Its totient is φ = 80770816.

The previous prime is 161808221. The next prime is 161808239. The reversal of 161808224 is 422808161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161808221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17252 + ... + 24924.

It is an arithmetic number, because the mean of its divisors is an integer number (13295205).

Almost surely, 2^161808224 is an apocalyptic number.

It is an amenable number.

161808224 is a deficient number, since it is larger than the sum of its proper divisors (157276696).

161808224 is an equidigital number, since it uses as much as digits as its factorization.

161808224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8342 (or 8334 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 161808224 is about 12720.3861576605. The cubic root of 161808224 is about 544.9209817263.

The spelling of 161808224 in words is "one hundred sixty-one million, eight hundred eight thousand, two hundred twenty-four".