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18700001887 = 7174127114143
BaseRepresentation
bin10001011010100110…
…110110001001011111
31210021020100112002111
4101122212312021133
5301244200030022
612331325534451
71231255251640
oct213246661137
953236315074
1018700001887
117a26733216
12375a714427
1319c0270798
14c957a56c7
15746a7b477
hex45a9b625f

18700001887 has 32 divisors (see below), whose sum is σ = 23267672064. Its totient is φ = 14662425600.

The previous prime is 18700001867. The next prime is 18700001891. The reversal of 18700001887 is 78810000781.

It is a cyclic number.

It is not a de Polignac number, because 18700001887 - 27 = 18700001759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18700001867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1315138 + ... + 1329280.

It is an arithmetic number, because the mean of its divisors is an integer number (727114752).

Almost surely, 218700001887 is an apocalyptic number.

18700001887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18700001887 is a deficient number, since it is larger than the sum of its proper divisors (4567670177).

18700001887 is a wasteful number, since it uses less digits than its factorization.

18700001887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14479.

The product of its (nonzero) digits is 25088, while the sum is 40.

The spelling of 18700001887 in words is "eighteen billion, seven hundred million, one thousand, eight hundred eighty-seven".

Divisors: 1 7 17 41 119 271 287 697 1897 4607 4879 11111 14143 32249 77777 99001 188887 240431 579863 1322209 1683017 3832753 4059041 9857671 26829271 65156801 69003697 157142873 456097607 1100000111 2671428841 18700001887