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208387726140 = 22351119294011429
BaseRepresentation
bin1100001000010011100…
…0000101101100111100
3201220212220021022200010
43002010320011230330
511403234224214030
6235422040103220
721025020306036
oct3020470055474
9656786238603
10208387726140
1180416490a80
1234478764b10
131685cc97039
14a12c076c56
155649a0b6b0
hex3084e05b3c

208387726140 has 384 divisors, whose sum is σ = 695350656000. Its totient is φ = 46061568000.

The previous prime is 208387726133. The next prime is 208387726171. The reversal of 208387726140 is 41627783802.

It is a self number, because there is not a number n which added to its sum of digits gives 208387726140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 145826946 + ... + 145828374.

It is an arithmetic number, because the mean of its divisors is an integer number (1810809000).

Almost surely, 2208387726140 is an apocalyptic number.

208387726140 is a gapful number since it is divisible by the number (20) 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 208387726140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347675328000).

208387726140 is an abundant number, since it is smaller than the sum of its proper divisors (486962929860).

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

208387726140 is a wasteful number, since it uses less digits than its factorization.

208387726140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1899 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The spelling of 208387726140 in words is "two hundred eight billion, three hundred eighty-seven million, seven hundred twenty-six thousand, one hundred forty".