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81268755 = 3517318701
BaseRepresentation
bin1001101100000…
…01000000010011
312122220212202220
410312001000103
5131301100010
612021512123
72004526101
oct466010023
9178825686
1081268755
1141968467
1223272643
1313ab5a29
14ab16c71
157204970
hex4d81013

81268755 has 16 divisors (see below), whose sum is σ = 137679264. Its totient is φ = 40793600.

The previous prime is 81268739. The next prime is 81268777. The reversal of 81268755 is 55786218.

It is not a de Polignac number, because 81268755 - 24 = 81268739 is a prime.

It is a super-2 number, since 2×812687552 = 13209221078500050, which contains 22 as substring.

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, 159096 + ... + 159605.

It is an arithmetic number, because the mean of its divisors is an integer number (8604954).

Almost surely, 281268755 is an apocalyptic number.

81268755 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81268755 is a deficient number, since it is larger than the sum of its proper divisors (56410509).

81268755 is a wasteful number, since it uses less digits than its factorization.

81268755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318726.

The product of its digits is 134400, while the sum is 42.

The square root of 81268755 is about 9014.9184688493. The cubic root of 81268755 is about 433.1528758797.

The spelling of 81268755 in words is "eighty-one million, two hundred sixty-eight thousand, seven hundred fifty-five".

Divisors: 1 3 5 15 17 51 85 255 318701 956103 1593505 4780515 5417917 16253751 27089585 81268755