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81532681776 = 243271323071559
BaseRepresentation
bin100101111101110111…
…0011111111000110000
321210110011010101010200
41023323232133320300
52313434331304101
6101242224155200
75614312234410
oct1137356377060
9253404111120
1081532681776
113163a089637
1213975168b00
1378c482a900
143d36548640
1521c2d21986
hex12fbb9fe30

81532681776 has 360 divisors, whose sum is σ = 283479356160. Its totient is φ = 21419334144.

The previous prime is 81532681759. The next prime is 81532681781. The reversal of 81532681776 is 67718623518.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 52297285 + ... + 52298843.

It is an arithmetic number, because the mean of its divisors is an integer number (787442656).

Almost surely, 281532681776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81532681776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141739678080).

81532681776 is an abundant number, since it is smaller than the sum of its proper divisors (201946674384).

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

81532681776 is a wasteful number, since it uses less digits than its factorization.

81532681776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1891 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 81532681776 in words is "eighty-one billion, five hundred thirty-two million, six hundred eighty-one thousand, seven hundred seventy-six".