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28082781 = 35163709
BaseRepresentation
bin110101100100…
…0001001011101
31221211202100000
41223020021131
524142122111
62441524513
7460461666
oct153101135
957752300
1028082781
1114941011
1294a3739
135a8343c
143a3036d
1526eac56
hex1ac825d

28082781 has 24 divisors (see below), whose sum is σ = 42384160. Its totient is φ = 18580752.

The previous prime is 28082777. The next prime is 28082783. The reversal of 28082781 is 18728082.

It is not a de Polignac number, because 28082781 - 22 = 28082777 is a prime.

It is a super-2 number, since 2×280827812 = 1577285177387922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28082783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39255 + ... + 39963.

Almost surely, 228082781 is an apocalyptic number.

It is an amenable number.

28082781 is a deficient number, since it is larger than the sum of its proper divisors (14301379).

28082781 is an equidigital number, since it uses as much as digits as its factorization.

28082781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28082781 is about 5299.3189185026. The cubic root of 28082781 is about 303.9578549897.

The spelling of 28082781 in words is "twenty-eight million, eighty-two thousand, seven hundred eighty-one".

Divisors: 1 3 9 27 81 163 243 489 709 1467 2127 4401 6381 13203 19143 39609 57429 115567 172287 346701 1040103 3120309 9360927 28082781