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27129987 = 324173523
BaseRepresentation
bin110011101111…
…1100010000011
31220001100100100
41213133202003
523421124422
62405253443
7446413113
oct147374203
956040310
1027129987
1114350185
129104283
13580b861
143863043
1525ad7ac
hex19df883

27129987 has 12 divisors (see below), whose sum is σ = 40144104. Its totient is φ = 17645280.

The previous prime is 27129983. The next prime is 27130007. The reversal of 27129987 is 78992172.

It is not a de Polignac number, because 27129987 - 22 = 27129983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27129983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36393 + ... + 37130.

It is an arithmetic number, because the mean of its divisors is an integer number (3345342).

Almost surely, 227129987 is an apocalyptic number.

27129987 is a deficient number, since it is larger than the sum of its proper divisors (13014117).

27129987 is a wasteful number, since it uses less digits than its factorization.

27129987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73570 (or 73567 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 27129987 is about 5208.6454093171. The cubic root of 27129987 is about 300.4806627996.

The spelling of 27129987 in words is "twenty-seven million, one hundred twenty-nine thousand, nine hundred eighty-seven".

Divisors: 1 3 9 41 123 369 73523 220569 661707 3014443 9043329 27129987