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208389638688 = 25371183933601
BaseRepresentation
bin1100001000010011111…
…1011000101000100000
3201220220000212111012020
43002010333120220200
511403240221414223
6235422145101440
721025042463010
oct3020477305040
9656800774166
10208389638688
11804175779a0
1234479327880
13168604b671a
14a12c413c40
155649c881e3
hex3084fd8a20

208389638688 has 192 divisors, whose sum is σ = 682835650560. Its totient is φ = 54061056000.

The previous prime is 208389638669. The next prime is 208389638701. The reversal of 208389638688 is 886836983802.

It is a super-2 number, since 2×2083896386882 (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6185088 + ... + 6218688.

It is an arithmetic number, because the mean of its divisors is an integer number (3556435680).

Almost surely, 2208389638688 is an apocalyptic number.

208389638688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208389638688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341417825280).

208389638688 is an abundant number, since it is smaller than the sum of its proper divisors (474446011872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208389638688 is a wasteful number, since it uses less digits than its factorization.

208389638688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34471 (or 34463 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 69.

The spelling of 208389638688 in words is "two hundred eight billion, three hundred eighty-nine million, six hundred thirty-eight thousand, six hundred eighty-eight".