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81291336 = 23372292113
BaseRepresentation
bin1001101100001…
…10100001001000
312122222000202020
410312012201020
5131302310321
612022204440
72004651660
oct466064110
9178860666
1081291336
1141983425
1223283720
1313ac30a9
14ab211a0
15720b4c6
hex4d86848

81291336 has 64 divisors (see below), whose sum is σ = 233385600. Its totient is φ = 23113728.

The previous prime is 81291307. The next prime is 81291377. The reversal of 81291336 is 63319218.

It is a junction number, because it is equal to n+sod(n) for n = 81291297 and 81291306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37416 + ... + 39528.

It is an arithmetic number, because the mean of its divisors is an integer number (3646650).

Almost surely, 281291336 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 81291336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116692800).

81291336 is an abundant number, since it is smaller than the sum of its proper divisors (152094264).

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

81291336 is a wasteful number, since it uses less digits than its factorization.

81291336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358 (or 2354 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 81291336 is about 9016.1708058355. The cubic root of 81291336 is about 433.1929901866.

The spelling of 81291336 in words is "eighty-one million, two hundred ninety-one thousand, three hundred thirty-six".

Divisors: 1 2 3 4 6 7 8 12 14 21 24 28 42 56 84 168 229 458 687 916 1374 1603 1832 2113 2748 3206 4226 4809 5496 6339 6412 8452 9618 12678 12824 14791 16904 19236 25356 29582 38472 44373 50712 59164 88746 118328 177492 354984 483877 967754 1451631 1935508 2903262 3387139 3871016 5806524 6774278 10161417 11613048 13548556 20322834 27097112 40645668 81291336