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8280081 = 321019109
BaseRepresentation
bin11111100101100000010001
3120120200010200
4133211200101
54104430311
6453245413
7130244115
oct37454021
916520120
108280081
114745a47
122933869
13193ba74
141157745
15ad8556
hex7e5811

8280081 has 12 divisors (see below), whose sum is σ = 12079860. Its totient is φ = 5464800.

The previous prime is 8280053. The next prime is 8280127. The reversal of 8280081 is 1800828.

It can be written as a sum of positive squares in 2 ways, for example, as 4730625 + 3549456 = 2175^2 + 1884^2 .

It is not a de Polignac number, because 8280081 - 25 = 8280049 is a prime.

It is a super-2 number, since 2×82800812 = 137119482733122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8280011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3646 + ... + 5463.

It is an arithmetic number, because the mean of its divisors is an integer number (1006655).

Almost surely, 28280081 is an apocalyptic number.

It is an amenable number.

8280081 is a deficient number, since it is larger than the sum of its proper divisors (3799779).

8280081 is a wasteful number, since it uses less digits than its factorization.

8280081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9216 (or 9213 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 8280081 is about 2877.5129886762. The cubic root of 8280081 is about 202.3072880833.

The spelling of 8280081 in words is "eight million, two hundred eighty thousand, eighty-one".

Divisors: 1 3 9 101 303 909 9109 27327 81981 920009 2760027 8280081