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28155 = 351877
BaseRepresentation
bin110110111111011
31102121210
412313323
51400110
6334203
7145041
oct66773
942553
1028155
111a176
1214363
13ca7a
14a391
158520
hex6dfb

28155 has 8 divisors (see below), whose sum is σ = 45072. Its totient is φ = 15008.

The previous prime is 28151. The next prime is 28163. The reversal of 28155 is 55182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28155 - 22 = 28151 is a prime.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (28151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924 + ... + 953.

It is an arithmetic number, because the mean of its divisors is an integer number (5634).

228155 is an apocalyptic number.

28155 is a deficient number, since it is larger than the sum of its proper divisors (16917).

28155 is a wasteful number, since it uses less digits than its factorization.

28155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885.

The product of its digits is 400, while the sum is 21.

The square root of 28155 is about 167.7945171929. The cubic root of 28155 is about 30.4218189391.

The spelling of 28155 in words is "twenty-eight thousand, one hundred fifty-five".

Divisors: 1 3 5 15 1877 5631 9385 28155