181616080 has 20 divisors (see below), whose sum is σ = 422257572. Its totient is φ = 72646400.

The previous prime is 181616077. The next prime is 181616081. The reversal of 181616080 is 80616181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 54287424 + 127328656 = 7368^2 + 11284^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181616081) 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, 1135021 + ... + 1135180.

Almost surely, 2^181616080 is an apocalyptic number.

181616080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181616080 is an abundant number, since it is smaller than the sum of its proper divisors (240641492).

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

181616080 is a wasteful number, since it uses less digits than its factorization.

181616080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270214 (or 2270208 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 181616080 is about 13476.5010295700. The cubic root of 181616080 is about 566.3063514880.

The spelling of 181616080 in words is "one hundred eighty-one million, six hundred sixteen thousand, eighty".