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68100185 = 513620037
BaseRepresentation
bin1000000111100…
…10000001011001
311202010211220002
410003302001121
5114413201220
610431342345
71454561546
oct403620131
9152124802
1068100185
113549374a
121a9819b5
1311154b8a
149089bcd
155ea2c75
hex40f2059

68100185 has 4 divisors (see below), whose sum is σ = 81720228. Its totient is φ = 54480144.

The previous prime is 68100169. The next prime is 68100187. The reversal of 68100185 is 58100186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30780304 + 37319881 = 5548^2 + 6109^2 .

It is a cyclic number.

It is not a de Polignac number, because 68100185 - 24 = 68100169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68100187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6810014 + ... + 6810023.

It is an arithmetic number, because the mean of its divisors is an integer number (20430057).

Almost surely, 268100185 is an apocalyptic number.

It is an amenable number.

68100185 is a deficient number, since it is larger than the sum of its proper divisors (13620043).

68100185 is a wasteful number, since it uses less digits than its factorization.

68100185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13620042.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 68100185 is about 8252.2836233372. The cubic root of 68100185 is about 408.3658631126.

Subtracting from 68100185 its reverse (58100186), we obtain a palindrome (9999999).

The spelling of 68100185 in words is "sixty-eight million, one hundred thousand, one hundred eighty-five".

Divisors: 1 5 13620037 68100185