Search a number
-
+
80138781 = 333797827
BaseRepresentation
bin1001100011011…
…01001000011101
312120210110202000
410301231020131
5131003420111
611541352513
71662111522
oct461551035
9176713660
1080138781
11412664a8
1222a08739
13137ab5c8
14a901149
15707ec56
hex4c6d21d

80138781 has 32 divisors (see below), whose sum is σ = 123338880. Its totient is φ = 51383808.

The previous prime is 80138777. The next prime is 80138797. The reversal of 80138781 is 18783108.

It is not a de Polignac number, because 80138781 - 22 = 80138777 is a prime.

It is a super-2 number, since 2×801387812 = 12844448440331922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80138701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96490 + ... + 97316.

It is an arithmetic number, because the mean of its divisors is an integer number (3854340).

Almost surely, 280138781 is an apocalyptic number.

It is an amenable number.

80138781 is a deficient number, since it is larger than the sum of its proper divisors (43200099).

80138781 is a wasteful number, since it uses less digits than its factorization.

80138781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 80138781 is about 8952.0266420515. The cubic root of 80138781 is about 431.1359562333.

The spelling of 80138781 in words is "eighty million, one hundred thirty-eight thousand, seven hundred eighty-one".

Divisors: 1 3 9 27 37 97 111 291 333 827 873 999 2481 2619 3589 7443 10767 22329 30599 32301 80219 91797 96903 240657 275391 721971 826173 2165913 2968103 8904309 26712927 80138781