181155072 has 144 divisors (see below), whose sum is σ = 569311232. Its totient is φ = 50042880.

The previous prime is 181155067. The next prime is 181155089. The reversal of 181155072 is 270551181.

It is a super-2 number, since 2×181155072² = 65634320222650368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166113 + ... + 167199.

Almost surely, 2^181155072 is an apocalyptic number.

181155072 is a gapful number since it is divisible by the number (12) 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 181155072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284655616).

181155072 is an abundant number, since it is smaller than the sum of its proper divisors (388156160).

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

181155072 is a wasteful number, since it uses less digits than its factorization.

181155072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 30.

The square root of 181155072 is about 13459.3860186860. The cubic root of 181155072 is about 565.8267813070.

The spelling of 181155072 in words is "one hundred eighty-one million, one hundred fifty-five thousand, seventy-two".