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BaseRepresentation
bin111000001001000
31110102121
413001020
51404434
6341024
7146542
oct70110
943377
1028744
111a661
1214774
1310111
14a692
1587b4
hex7048

28744 has 8 divisors (see below), whose sum is σ = 53910. Its totient is φ = 14368.

The previous prime is 28729. The next prime is 28751. The reversal of 28744 is 44782.

It can be written as a sum of positive squares in only one way, i.e., 26244 + 2500 = 162^2 + 50^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1789 + ... + 1804.

228744 is an apocalyptic number.

It is an amenable number.

28744 is a deficient number, since it is larger than the sum of its proper divisors (25166).

28744 is a wasteful number, since it uses less digits than its factorization.

28744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3599 (or 3595 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 28744 is about 169.5405556202. The cubic root of 28744 is about 30.6324971233.

The spelling of 28744 in words is "twenty-eight thousand, seven hundred forty-four".

Divisors: 1 2 4 8 3593 7186 14372 28744