30028181 has 8 divisors (see below), whose sum is σ = 31060224. Its totient is φ = 29000160.

The previous prime is 30028177. The next prime is 30028211. The reversal of 30028181 is 18182003.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30028181 - 2² = 30028177 is a prime.

It is a super-2 number, since 2×30028181² = 1803383308337522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30028111) 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, 26825 + ... + 27921.

It is an arithmetic number, because the mean of its divisors is an integer number (3882528).

Almost surely, 2^30028181 is an apocalyptic number.

30028181 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

30028181 is a deficient number, since it is larger than the sum of its proper divisors (1032043).

30028181 is a wasteful number, since it uses less digits than its factorization.

30028181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 30028181 is about 5479.7975327561. The cubic root of 30028181 is about 310.8205145010.

The spelling of 30028181 in words is "thirty million, twenty-eight thousand, one hundred eighty-one".