[go: up one dir, main page]

Search a number
-
+
639920871 = 3335367141
BaseRepresentation
bin100110001001000…
…110101011100111
31122121010100102000
4212021012223213
52302304431441
6143255420343
721600144342
oct4611065347
91577110360
10639920871
112a9245027
1215a3846b3
13a2765405
1460db9459
153b2a62b6
hex26246ae7

639920871 has 16 divisors (see below), whose sum is σ = 950730720. Its totient is φ = 425399040.

The previous prime is 639920867. The next prime is 639920891. The reversal of 639920871 is 178029936.

639920871 is a `hidden beast` number, since 639 + 9 + 2 + 0 + 8 + 7 + 1 = 666.

639920871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639920871 - 22 = 639920867 is a prime.

It is a super-2 number, since 2×6399208712 = 818997442282797282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639920821) 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, 24040 + ... + 43101.

It is an arithmetic number, because the mean of its divisors is an integer number (59420670).

Almost surely, 2639920871 is an apocalyptic number.

639920871 is a deficient number, since it is larger than the sum of its proper divisors (310809849).

639920871 is a wasteful number, since it uses less digits than its factorization.

639920871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67503 (or 67497 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 639920871 is about 25296.6573088224. The cubic root of 639920871 is about 861.7383582442.

The spelling of 639920871 in words is "six hundred thirty-nine million, nine hundred twenty thousand, eight hundred seventy-one".

Divisors: 1 3 9 27 353 1059 3177 9531 67141 201423 604269 1812807 23700773 71102319 213306957 639920871