181340028 has 36 divisors (see below), whose sum is σ = 482514760. Its totient is φ = 57265056.

The previous prime is 181340021. The next prime is 181340041. The reversal of 181340028 is 820043181.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 181339983 and 181340010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181340021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131875 + ... + 133242.

Almost surely, 2^181340028 is an apocalyptic number.

181340028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

181340028 is an abundant number, since it is smaller than the sum of its proper divisors (301174732).

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

181340028 is a wasteful number, since it uses less digits than its factorization.

181340028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265146 (or 265141 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 181340028 is about 13466.2551587292. The cubic root of 181340028 is about 566.0192820578.

The spelling of 181340028 in words is "one hundred eighty-one million, three hundred forty thousand, twenty-eight".