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28685180690 = 25171011670657
BaseRepresentation
bin11010101101110001…
…010001111100010010
32202001010020011100122
4122231301101330102
5432221401240230
621102222550242
72033563004255
oct325561217422
982033204318
1028685180690
1111190044901
125686738382
132921b6baca
14156198b09c
15b2d4acbe5
hex6adc51f12

28685180690 has 32 divisors (see below), whose sum is σ = 55211905584. Its totient is φ = 10692198400.

The previous prime is 28685180681. The next prime is 28685180701. The reversal of 28685180690 is 9608158682.

It is a Cunningham number, because it is equal to 1693672+1.

It can be written as a sum of positive squares in 8 ways, for example, as 17082228601 + 11602952089 = 130699^2 + 107717^2 .

It is a super-2 number, since 2×286851806902 (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 818159 + ... + 852498.

Almost surely, 228685180690 is an apocalyptic number.

28685180690 is a deficient number, since it is larger than the sum of its proper divisors (26526724894).

28685180690 is a wasteful number, since it uses less digits than its factorization.

28685180690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670782.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 28685180690 in words is "twenty-eight billion, six hundred eighty-five million, one hundred eighty thousand, six hundred ninety".

Divisors: 1 2 5 10 17 34 85 101 170 202 505 1010 1717 3434 8585 17170 1670657 3341314 8353285 16706570 28401169 56802338 142005845 168736357 284011690 337472714 843681785 1687363570 2868518069 5737036138 14342590345 28685180690