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28056188 = 2217412591
BaseRepresentation
bin110101100000…
…1101001111100
31221210101212002
41223001221330
524140244223
62441201432
7460321316
oct153015174
957711762
1028056188
1114923036
129490278
135a742c4
143a247b6
1526e2e28
hex1ac1a7c

28056188 has 12 divisors (see below), whose sum is σ = 51986592. Its totient is φ = 13202880.

The previous prime is 28056187. The next prime is 28056191. The reversal of 28056188 is 88165082.

It is a super-3 number, since 3×280561883 (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28056187) 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 3 ways as a sum of consecutive naturals, for example, 206228 + ... + 206363.

It is an arithmetic number, because the mean of its divisors is an integer number (4332216).

Almost surely, 228056188 is an apocalyptic number.

It is an amenable number.

28056188 is a deficient number, since it is larger than the sum of its proper divisors (23930404).

28056188 is a wasteful number, since it uses less digits than its factorization.

28056188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412612 (or 412610 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 28056188 is about 5296.8092282052. The cubic root of 28056188 is about 303.8618803540.

The spelling of 28056188 in words is "twenty-eight million, fifty-six thousand, one hundred eighty-eight".

Divisors: 1 2 4 17 34 68 412591 825182 1650364 7014047 14028094 28056188