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28009306 = 2131931259
BaseRepresentation
bin110101011011…
…0001101011010
31221201000112201
41222312031122
524132244211
62440200414
7460034533
oct152661532
957630481
1028009306
11148a0896
12946910a
135a58b70
143a1168a
1526d40c1
hex1ab635a

28009306 has 48 divisors (see below), whose sum is σ = 50047200. Its totient is φ = 11651040.

The previous prime is 28009301. The next prime is 28009307. The reversal of 28009306 is 60390082.

It is not an unprimeable number, because it can be changed into a prime (28009301) 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, 474705 + ... + 474763.

It is an arithmetic number, because the mean of its divisors is an integer number (1042650).

Almost surely, 228009306 is an apocalyptic number.

28009306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28009306 is a deficient number, since it is larger than the sum of its proper divisors (22037894).

28009306 is a wasteful number, since it uses less digits than its factorization.

28009306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 28009306 is about 5292.3818834245. The cubic root of 28009306 is about 303.6925345291.

Adding to 28009306 its reverse (60390082), we get a palindrome (88399388).

The spelling of 28009306 in words is "twenty-eight million, nine thousand, three hundred six".

Divisors: 1 2 13 19 26 31 38 59 62 118 247 403 494 589 767 806 961 1121 1178 1534 1829 1922 2242 3658 7657 12493 14573 15314 18259 23777 24986 29146 34751 36518 47554 56699 69502 113398 237367 451763 474734 737087 903526 1077281 1474174 2154562 14004653 28009306