181028240 has 40 divisors (see below), whose sum is σ = 445652280. Its totient is φ = 68151296.

The previous prime is 181028233. The next prime is 181028273. The reversal of 181028240 is 42820181.

It can be written as a sum of positive squares in 4 ways, for example, as 53699584 + 127328656 = 7328^2 + 11284^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65195 + ... + 67914.

It is an arithmetic number, because the mean of its divisors is an integer number (11141307).

Almost surely, 2^181028240 is an apocalyptic number.

181028240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181028240 is an abundant number, since it is smaller than the sum of its proper divisors (264624040).

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

181028240 is a wasteful number, since it uses less digits than its factorization.

181028240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133139 (or 133133 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 181028240 is about 13454.6735374739. The cubic root of 181028240 is about 565.6946998141.

The spelling of 181028240 in words is "one hundred eighty-one million, twenty-eight thousand, two hundred forty".