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56128305 = 35171032137
BaseRepresentation
bin1101011000011…
…1001100110001
310220121121120010
43112013030301
5103332101210
65323005133
71251040242
oct326071461
9126547503
1056128305
1129757032
12169697a9
13b82291c
147650cc9
154dda920
hex3587331

56128305 has 32 divisors (see below), whose sum is σ = 96056064. Its totient is φ = 27887616.

The previous prime is 56128301. The next prime is 56128307. The reversal of 56128305 is 50382165.

56128305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56128305 - 22 = 56128301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56128301) 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 31 ways as a sum of consecutive naturals, for example, 25197 + ... + 27333.

It is an arithmetic number, because the mean of its divisors is an integer number (3001752).

Almost surely, 256128305 is an apocalyptic number.

It is an amenable number.

56128305 is a deficient number, since it is larger than the sum of its proper divisors (39927759).

56128305 is a wasteful number, since it uses less digits than its factorization.

56128305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 56128305 is about 7491.8826071956. The cubic root of 56128305 is about 382.8782025392.

The spelling of 56128305 in words is "fifty-six million, one hundred twenty-eight thousand, three hundred five".

Divisors: 1 3 5 15 17 51 85 103 255 309 515 1545 1751 2137 5253 6411 8755 10685 26265 32055 36329 108987 181645 220111 544935 660333 1100555 3301665 3741887 11225661 18709435 56128305