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28826161 = 72132592
BaseRepresentation
bin110110111110…
…1101000110001
32000020112001121
41231331220301
524334414121
62505502241
7500006200
oct155755061
960215047
1028826161
11152a9581
1297a1981
135c83900
143b85237
1527e6141
hex1b7da31

28826161 has 27 divisors (see below), whose sum is σ = 36936171. Its totient is φ = 22420944.

The previous prime is 28826159. The next prime is 28826177. The reversal of 28826161 is 16162882.

The square root of 28826161 is 5369.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4264225 + 24561936 = 2065^2 + 4956^2 .

It is not a de Polignac number, because 28826161 - 21 = 28826159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28826141) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 488550 + ... + 488608.

Almost surely, 228826161 is an apocalyptic number.

28826161 is the 5369-th square number.

28826161 is the 2685-th centered octagonal number.

It is an amenable number.

28826161 is a deficient number, since it is larger than the sum of its proper divisors (8110010).

28826161 is an equidigital number, since it uses as much as digits as its factorization.

28826161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 79 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The cubic root of 28826161 is about 306.6165570036.

Multiplying 28826161 by its product of digits (9216), we get a square (265661899776 = 5154242).

The spelling of 28826161 in words is "twenty-eight million, eight hundred twenty-six thousand, one hundred sixty-one".

Divisors: 1 7 13 49 59 91 169 413 637 767 1183 2891 3481 5369 8281 9971 24367 37583 45253 69797 170569 316771 488579 588289 2217397 4118023 28826161