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28520829 = 34352109
BaseRepresentation
bin110110011001…
…1000101111101
31222200000020000
41230303011331
524300131304
62455144513
7464265051
oct154630575
958600200
1028520829
1115110137
129675139
135ba793c
143b05c61
152785939
hex1b3317d

28520829 has 10 divisors (see below), whose sum is σ = 42605310. Its totient is φ = 19013832.

The previous prime is 28520827. The next prime is 28520839. The reversal of 28520829 is 92802582.

It can be written as a sum of positive squares in only one way, i.e., 24235929 + 4284900 = 4923^2 + 2070^2 .

It is not a de Polignac number, because 28520829 - 21 = 28520827 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28520793 and 28520802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28520827) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 175974 + ... + 176135.

It is an arithmetic number, because the mean of its divisors is an integer number (4260531).

Almost surely, 228520829 is an apocalyptic number.

It is an amenable number.

28520829 is a deficient number, since it is larger than the sum of its proper divisors (14084481).

28520829 is an equidigital number, since it uses as much as digits as its factorization.

28520829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352121 (or 352112 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28520829 is about 5340.4895842984. The cubic root of 28520829 is about 305.5301323984.

The spelling of 28520829 in words is "twenty-eight million, five hundred twenty thousand, eight hundred twenty-nine".

Divisors: 1 3 9 27 81 352109 1056327 3168981 9506943 28520829