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28678 = 2131103
BaseRepresentation
bin111000000000110
31110100011
413000012
51404203
6340434
7146416
oct70006
943304
1028678
111a601
121471a
1310090
14a646
15876d
hex7006

28678 has 8 divisors (see below), whose sum is σ = 46368. Its totient is φ = 13224.

The previous prime is 28669. The next prime is 28687. The reversal of 28678 is 87682.

It is an interprime number because it is at equal distance from previous prime (28669) and next prime (28687).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526 + ... + 577.

It is an arithmetic number, because the mean of its divisors is an integer number (5796).

28678 is a Friedman number, since it can be written as (8*8)^2*7+6, using all its digits and the basic arithmetic operations.

228678 is an apocalyptic number.

28678 is a deficient number, since it is larger than the sum of its proper divisors (17690).

28678 is a wasteful number, since it uses less digits than its factorization.

28678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118.

The product of its digits is 5376, while the sum is 31.

The square root of 28678 is about 169.3458000660. The cubic root of 28678 is about 30.6090337433.

The spelling of 28678 in words is "twenty-eight thousand, six hundred seventy-eight".

Divisors: 1 2 13 26 1103 2206 14339 28678