181100028 has 48 divisors (see below), whose sum is σ = 432432000. Its totient is φ = 58970688.

The previous prime is 181100027. The next prime is 181100053. The reversal of 181100028 is 820001181.

It is a junction number, because it is equal to n+sod(n) for n = 181099977 and 181100013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181100027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126018 + ... + 127446.

It is an arithmetic number, because the mean of its divisors is an integer number (9009000).

Almost surely, 2^181100028 is an apocalyptic number.

It is an amenable number.

181100028 is an abundant number, since it is smaller than the sum of its proper divisors (251331972).

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

181100028 is a wasteful number, since it uses less digits than its factorization.

181100028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 181100028 is about 13457.3410449464. The cubic root of 181100028 is about 565.7694666465.

The spelling of 181100028 in words is "one hundred eighty-one million, one hundred thousand, twenty-eight".