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18000128 = 2870313
BaseRepresentation
bin100010010101…
…0100100000000
31020212111112102
41010222210000
514102001003
61441445532
7305666336
oct104524400
936774472
1018000128
11a184843
1260408a8
133963083
142567b56
1518a8588
hex112a900

18000128 has 18 divisors (see below), whose sum is σ = 35930454. Its totient is φ = 8999936.

The previous prime is 18000089. The next prime is 18000137. The reversal of 18000128 is 82100081.

It can be written as a sum of positive squares in only one way, i.e., 9048064 + 8952064 = 3008^2 + 2992^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34901 + ... + 35412.

Almost surely, 218000128 is an apocalyptic number.

It is an amenable number.

18000128 is a deficient number, since it is larger than the sum of its proper divisors (17930326).

18000128 is an frugal number, since it uses more digits than its factorization.

18000128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70329 (or 70315 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 18000128 is about 4242.6557720371. The cubic root of 18000128 is about 262.0747606322.

The spelling of 18000128 in words is "eighteen million, one hundred twenty-eight", and thus it is an aban number.

Divisors: 1 2 4 8 16 32 64 128 256 70313 140626 281252 562504 1125008 2250016 4500032 9000064 18000128