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2808008081 = 191471100469
BaseRepresentation
bin1010011101011110…
…1100110110010001
321020200202120221022
42213113230312101
521222322224311
61142345205225
7126404450324
oct24727546621
97220676838
102808008081
11121105803a
12664490815
133599a2258
141c8d0a7bb
151167bc5db
hexa75ecd91

2808008081 has 8 divisors (see below), whose sum is σ = 2957836800. Its totient is φ = 2658383280.

The previous prime is 2808008069. The next prime is 2808008087. The reversal of 2808008081 is 1808008082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2808008081 - 26 = 2808008017 is a prime.

It is a super-2 number, since 2×28080080812 = 15769818765922605122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2808008087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22286 + ... + 78183.

It is an arithmetic number, because the mean of its divisors is an integer number (369729600).

Almost surely, 22808008081 is an apocalyptic number.

It is an amenable number.

2808008081 is a deficient number, since it is larger than the sum of its proper divisors (149828719).

2808008081 is a wasteful number, since it uses less digits than its factorization.

2808008081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101959.

The product of its (nonzero) digits is 8192, while the sum is 35.

The square root of 2808008081 is about 52990.6414473348. The cubic root of 2808008081 is about 1410.8021659884.

Subtracting from 2808008081 its reverse (1808008082), we obtain a palindrome (999999999).

The spelling of 2808008081 in words is "two billion, eight hundred eight million, eight thousand, eighty-one".

Divisors: 1 19 1471 27949 100469 1908911 147789899 2808008081