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28068187 = 719211039
BaseRepresentation
bin110101100010…
…0100101011011
31221211000022111
41223010211123
524141140222
62441333151
7460401310
oct153044533
957730274
1028068187
1114931054
1294971b7
135a798c4
143a28d07
1526e6777
hex1ac495b

28068187 has 8 divisors (see below), whose sum is σ = 33766400. Its totient is φ = 22792104.

The previous prime is 28068181. The next prime is 28068199. The reversal of 28068187 is 78186082.

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 28068187 - 27 = 28068059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28068181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105387 + ... + 105652.

It is an arithmetic number, because the mean of its divisors is an integer number (4220800).

Almost surely, 228068187 is an apocalyptic number.

28068187 is a deficient number, since it is larger than the sum of its proper divisors (5698213).

28068187 is a wasteful number, since it uses less digits than its factorization.

28068187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211065.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 28068187 is about 5297.9417701594. The cubic root of 28068187 is about 303.9051924752.

The spelling of 28068187 in words is "twenty-eight million, sixty-eight thousand, one hundred eighty-seven".

Divisors: 1 7 19 133 211039 1477273 4009741 28068187