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81230256 = 2433593187
BaseRepresentation
bin1001101011101…
…11100110110000
312122211220222000
410311313212300
5131243332011
612021014000
72004305622
oct465674660
9178756860
1081230256
1141941548
1223254300
1313aa1353
14ab06c12
1571e8356
hex4d779b0

81230256 has 80 divisors (see below), whose sum is σ = 237187200. Its totient is φ = 26609472.

The previous prime is 81230221. The next prime is 81230269. The reversal of 81230256 is 65203218.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 23895 + ... + 27081.

It is an arithmetic number, because the mean of its divisors is an integer number (2964840).

Almost surely, 281230256 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 81230256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118593600).

81230256 is an abundant number, since it is smaller than the sum of its proper divisors (155956944).

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

81230256 is a wasteful number, since it uses less digits than its factorization.

81230256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263 (or 3251 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 81230256 is about 9012.7829220502. The cubic root of 81230256 is about 433.0844667003.

The spelling of 81230256 in words is "eighty-one million, two hundred thirty thousand, two hundred fifty-six".

Divisors: 1 2 3 4 6 8 9 12 16 18 24 27 36 48 54 59 72 108 118 144 177 216 236 354 432 472 531 708 944 1062 1416 1593 2124 2832 3186 3187 4248 6372 6374 8496 9561 12744 12748 19122 25488 25496 28683 38244 50992 57366 76488 86049 114732 152976 172098 188033 229464 344196 376066 458928 564099 688392 752132 1128198 1376784 1504264 1692297 2256396 3008528 3384594 4512792 5076891 6769188 9025584 10153782 13538376 20307564 27076752 40615128 81230256