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81016 = 23131941
BaseRepresentation
bin10011110001111000
311010010121
4103301320
510043031
61423024
7455125
oct236170
9133117
1081016
1155961
123aa74
132ab50
142174c
1519011
hex13c78

81016 has 32 divisors (see below), whose sum is σ = 176400. Its totient is φ = 34560.

The previous prime is 81013. The next prime is 81017. The reversal of 81016 is 61018.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1956 + ... + 1996.

281016 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 81016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88200).

81016 is an abundant number, since it is smaller than the sum of its proper divisors (95384).

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

81016 is a wasteful number, since it uses less digits than its factorization.

81016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 81016 is about 284.6330971619. The cubic root of 81016 is about 43.2703358097.

It can be divided in two parts, 8 and 1016, that multiplied together give a triangular number (8128 = T127).

The spelling of 81016 in words is "eighty-one thousand, sixteen".

Divisors: 1 2 4 8 13 19 26 38 41 52 76 82 104 152 164 247 328 494 533 779 988 1066 1558 1976 2132 3116 4264 6232 10127 20254 40508 81016