Search a number
-
+
28912036447 = 731320341597
BaseRepresentation
bin11010111011010010…
…101010101001011111
32202121221002121221201
4122323102222221133
5433202440131242
621140525140331
72042316153310
oct327322525137
982557077851
1028912036447
11112970aa9a8
12572a6ba6a7
132959b69b98
141583b60607
15b4336e4b7
hex6bb4aaa5f

28912036447 has 16 divisors (see below), whose sum is σ = 34119677952. Its totient is φ = 23974270560.

The previous prime is 28912036429. The next prime is 28912036453. The reversal of 28912036447 is 74463021982.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-28912036447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28912036397 and 28912036406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28912036427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674253 + ... + 715849.

It is an arithmetic number, because the mean of its divisors is an integer number (2132479872).

Almost surely, 228912036447 is an apocalyptic number.

28912036447 is a deficient number, since it is larger than the sum of its proper divisors (5207641505).

28912036447 is a wasteful number, since it uses less digits than its factorization.

28912036447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44838.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 28912036447 in words is "twenty-eight billion, nine hundred twelve million, thirty-six thousand, four hundred forty-seven".

Divisors: 1 7 31 217 3203 22421 41597 99293 291179 695051 1289507 9026549 133235191 932646337 4130290921 28912036447