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68000080 = 2453722973
BaseRepresentation
bin1000000110110…
…01100101010000
311201221202120111
410003121211100
5114402000310
610425251104
71453663651
oct403314520
9151852514
1068000080
1135425515
121a933a94
131111b445
149061528
155e8328a
hex40d9950

68000080 has 40 divisors (see below), whose sum is σ = 162380232. Its totient is φ = 26463744.

The previous prime is 68000077. The next prime is 68000129. The reversal of 68000080 is 8000086.

It can be written as a sum of positive squares in 4 ways, for example, as 20720704 + 47279376 = 4552^2 + 6876^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8527 + ... + 14446.

Almost surely, 268000080 is an apocalyptic number.

It is an amenable number.

68000080 is an abundant number, since it is smaller than the sum of its proper divisors (94380152).

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

68000080 is a wasteful number, since it uses less digits than its factorization.

68000080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23023 (or 23017 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 68000080 is about 8246.2161019464. The cubic root of 68000080 is about 408.1656702566.

The spelling of 68000080 in words is "sixty-eight million, eighty", and thus it is an aban number and an uban number.

Divisors: 1 2 4 5 8 10 16 20 37 40 74 80 148 185 296 370 592 740 1480 2960 22973 45946 91892 114865 183784 229730 367568 459460 850001 918920 1700002 1837840 3400004 4250005 6800008 8500010 13600016 17000020 34000040 68000080