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81833364768 = 2536712722849
BaseRepresentation
bin100110000110110100…
…1100000110100100000
321211020002220122122210
41030031221200310200
52320043320133033
6101332125002120
75624623060251
oct1141551406440
9254202818583
1081833364768
113178388a181
1213a399b3340
137941c0753c
143d64458b28
1521de417d63
hex130da60d20

81833364768 has 48 divisors (see below), whose sum is σ = 218018757600. Its totient is φ = 26870654976.

The previous prime is 81833364733. The next prime is 81833364779. The reversal of 81833364768 is 86746333818.

It is a tau number, because it is divible by the number of its divisors (48).

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, 6354993 + ... + 6367856.

It is an arithmetic number, because the mean of its divisors is an integer number (4542057450).

Almost surely, 281833364768 is an apocalyptic number.

It is an amenable number.

81833364768 is an abundant number, since it is smaller than the sum of its proper divisors (136185392832).

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

81833364768 is a wasteful number, since it uses less digits than its factorization.

81833364768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12722929 (or 12722921 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 57.

The spelling of 81833364768 in words is "eighty-one billion, eight hundred thirty-three million, three hundred sixty-four thousand, seven hundred sixty-eight".

Divisors: 1 2 3 4 6 8 12 16 24 32 48 67 96 134 201 268 402 536 804 1072 1608 2144 3216 6432 12722849 25445698 38168547 50891396 76337094 101782792 152674188 203565584 305348376 407131168 610696752 852430883 1221393504 1704861766 2557292649 3409723532 5114585298 6819447064 10229170596 13638894128 20458341192 27277788256 40916682384 81833364768