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68888930 = 25112172197
BaseRepresentation
bin1000001101100…
…10100101100010
311210121220211212
410012302211202
5120113421210
610500310122
71464355235
oct406624542
9153556755
1068888930
1135982300
121b0a2342
131136cba6
14921341c
1560ab805
hex41b2962

68888930 has 72 divisors (see below), whose sum is σ = 145521684. Its totient is φ = 23457280.

The previous prime is 68888929. The next prime is 68888951. The reversal of 68888930 is 3988886.

It can be written as a sum of positive squares in 6 ways, for example, as 65011969 + 3876961 = 8063^2 + 1969^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 349592 + ... + 349788.

Almost surely, 268888930 is an apocalyptic number.

68888930 is an abundant number, since it is smaller than the sum of its proper divisors (76632754).

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

68888930 is a wasteful number, since it uses less digits than its factorization.

68888930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 68888930 is about 8299.9355419184. The cubic root of 68888930 is about 409.9363970345.

The spelling of 68888930 in words is "sixty-eight million, eight hundred eighty-eight thousand, nine hundred thirty".

Divisors: 1 2 5 10 11 17 22 34 55 85 110 121 170 187 197 242 289 374 394 578 605 935 985 1210 1445 1870 1970 2057 2167 2890 3179 3349 4114 4334 6358 6698 10285 10835 15895 16745 20570 21670 23837 31790 33490 34969 36839 47674 56933 69938 73678 113866 119185 174845 184195 238370 284665 349690 368390 405229 569330 626263 810458 1252526 2026145 3131315 4052290 6262630 6888893 13777786 34444465 68888930