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30287 = 31977
BaseRepresentation
bin111011001001111
31112112202
413121033
51432122
6352115
7154205
oct73117
945482
1030287
1120834
121563b
1310a2a
14b075
158e92
hex764f

30287 has 4 divisors (see below), whose sum is σ = 31296. Its totient is φ = 29280.

The previous prime is 30271. The next prime is 30293. The reversal of 30287 is 78203.

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

It is a cyclic number.

It is not a de Polignac number, because 30287 - 24 = 30271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 30287.

It is not an unprimeable number, because it can be changed into a prime (30187) 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, 458 + ... + 519.

It is an arithmetic number, because the mean of its divisors is an integer number (7824).

230287 is an apocalyptic number.

30287 is a deficient number, since it is larger than the sum of its proper divisors (1009).

30287 is an equidigital number, since it uses as much as digits as its factorization.

30287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 30287 is about 174.0316063248. The cubic root of 30287 is about 31.1710969455.

The spelling of 30287 in words is "thirty thousand, two hundred eighty-seven".

Divisors: 1 31 977 30287