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28608424 = 23131391979
BaseRepresentation
bin110110100100…
…0011110101000
31222211110101021
41231020132220
524310432144
62501102224
7465111325
oct155103650
958743337
1028608424
111516aa29
1296b7974
135c08780
143b29b4c
1527a1884
hex1b487a8

28608424 has 32 divisors (see below), whose sum is σ = 58212000. Its totient is φ = 13102272.

The previous prime is 28608421. The next prime is 28608431. The reversal of 28608424 is 42480682.

Together with 29603576 it forms an amicable pair .

It is a self number, because there is not a number n which added to its sum of digits gives 28608424.

It is not an unprimeable number, because it can be changed into a prime (28608421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13467 + ... + 15445.

It is an arithmetic number, because the mean of its divisors is an integer number (1819125).

Almost surely, 228608424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28608424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29106000).

28608424 is an abundant number, since it is smaller than the sum of its proper divisors (29603576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28608424 is a wasteful number, since it uses less digits than its factorization.

28608424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137 (or 2133 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 28608424 is about 5348.6843242053. The cubic root of 28608424 is about 305.8426006410.

The spelling of 28608424 in words is "twenty-eight million, six hundred eight thousand, four hundred twenty-four".

Divisors: 1 2 4 8 13 26 52 104 139 278 556 1112 1807 1979 3614 3958 7228 7916 14456 15832 25727 51454 102908 205816 275081 550162 1100324 2200648 3576053 7152106 14304212 28608424