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28916161 = 29997109
BaseRepresentation
bin110111001001…
…1100111000001
32000102002111221
41232103213001
524400304121
62511435041
7500532451
oct156234701
960362457
1028916161
111536015a
129825a81
135cb5871
143ba9d61
152812b41
hex1b939c1

28916161 has 4 divisors (see below), whose sum is σ = 29913300. Its totient is φ = 27919024.

The previous prime is 28916143. The next prime is 28916177. The reversal of 28916161 is 16161982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13549761 + 15366400 = 3681^2 + 3920^2 .

It is a cyclic number.

It is not a de Polignac number, because 28916161 - 27 = 28916033 is a prime.

It is a super-2 number, since 2×289161612 = 1672288733955842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28916101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498526 + ... + 498583.

It is an arithmetic number, because the mean of its divisors is an integer number (7478325).

Almost surely, 228916161 is an apocalyptic number.

It is an amenable number.

28916161 is a deficient number, since it is larger than the sum of its proper divisors (997139).

28916161 is an equidigital number, since it uses as much as digits as its factorization.

28916161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997138.

The product of its digits is 5184, while the sum is 34.

The square root of 28916161 is about 5377.3749171878. The cubic root of 28916161 is about 306.9353278663.

The spelling of 28916161 in words is "twenty-eight million, nine hundred sixteen thousand, one hundred sixty-one".

Divisors: 1 29 997109 28916161