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8640709 = 7211172341
BaseRepresentation
bin100000111101…
…100011000101
3121020222211021
4200331203011
54203000314
6505111141
7133305400
oct40754305
917228737
108640709
114971990
122a884b1
131a36c5c
14120cd37
15b5a324
hex83d8c5

8640709 has 48 divisors (see below), whose sum is σ = 12410496. Its totient is φ = 5913600.

The previous prime is 8640707. The next prime is 8640713. The reversal of 8640709 is 9070468.

It is not a de Polignac number, because 8640709 - 21 = 8640707 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

8640709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640701) 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 47 ways as a sum of consecutive naturals, for example, 210729 + ... + 210769.

It is an arithmetic number, because the mean of its divisors is an integer number (258552).

Almost surely, 28640709 is an apocalyptic number.

It is an amenable number.

8640709 is a deficient number, since it is larger than the sum of its proper divisors (3769787).

8640709 is a wasteful number, since it uses less digits than its factorization.

8640709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 8640709 is about 2939.5082922149. The cubic root of 8640709 is about 205.2027262854.

The spelling of 8640709 in words is "eight million, six hundred forty thousand, seven hundred nine".

Divisors: 1 7 11 17 23 41 49 77 119 161 187 253 287 391 451 539 697 833 943 1127 1309 1771 2009 2737 3157 4301 4879 6601 7667 9163 10373 12397 16031 19159 22099 30107 34153 46207 53669 72611 112217 176341 210749 375683 508277 785519 1234387 8640709