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28130181 = 327733851
BaseRepresentation
bin110101101001…
…1101110000101
31221221011100120
41223103232011
524200131211
62442532153
7461050122
oct153235605
957834316
1028130181
1114973692
129507059
135a9bba1
143a43749
152709d06
hex1ad3b85

28130181 has 8 divisors (see below), whose sum is σ = 37643424. Its totient is φ = 18685200.

The previous prime is 28130159. The next prime is 28130191. The reversal of 28130181 is 18103182.

28130181 is nontrivially palindromic in base 12.

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

It is not a de Polignac number, because 28130181 - 25 = 28130149 is a prime.

It is a super-2 number, since 2×281301812 = 1582614166185522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130191) 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, 16095 + ... + 17756.

It is an arithmetic number, because the mean of its divisors is an integer number (4705428).

Almost surely, 228130181 is an apocalyptic number.

It is an amenable number.

28130181 is a deficient number, since it is larger than the sum of its proper divisors (9513243).

28130181 is a wasteful number, since it uses less digits than its factorization.

28130181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34131.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 28130181 is about 5303.7893057700. The cubic root of 28130181 is about 304.1287723439.

The spelling of 28130181 in words is "twenty-eight million, one hundred thirty thousand, one hundred eighty-one".

Divisors: 1 3 277 831 33851 101553 9376727 28130181