181913028 has 24 divisors (see below), whose sum is σ = 463051680. Its totient is φ = 55125120.

The previous prime is 181913021. The next prime is 181913029. The reversal of 181913028 is 820319181.

It is a super-2 number, since 2×181913028² = 66184699512257568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 181913028.

It is not an unprimeable number, because it can be changed into a prime (181913021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688933 + ... + 689196.

It is an arithmetic number, because the mean of its divisors is an integer number (19293820).

Almost surely, 2^181913028 is an apocalyptic number.

It is an amenable number.

181913028 is an abundant number, since it is smaller than the sum of its proper divisors (281138652).

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

181913028 is a wasteful number, since it uses less digits than its factorization.

181913028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378147 (or 1378145 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 181913028 is about 13487.5137812719. The cubic root of 181913028 is about 566.6148263226.

The spelling of 181913028 in words is "one hundred eighty-one million, nine hundred thirteen thousand, twenty-eight".