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81052288 = 27633221
BaseRepresentation
bin1001101010011…
…00001010000000
312122111212211121
410311030022000
5131222133123
612013122024
72002635022
oct465141200
9178455747
1081052288
114182a869
1223189314
1313a3b345
14aa9c012
1571b075d
hex4d4c280

81052288 has 16 divisors (see below), whose sum is σ = 161471610. Its totient is φ = 40526080.

The previous prime is 81052261. The next prime is 81052331. The reversal of 81052288 is 88225018.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 80425024 + 627264 = 8968^2 + 792^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316483 + ... + 316738.

Almost surely, 281052288 is an apocalyptic number.

It is an amenable number.

81052288 is a deficient number, since it is larger than the sum of its proper divisors (80419322).

81052288 is an equidigital number, since it uses as much as digits as its factorization.

81052288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633235 (or 633223 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 81052288 is about 9002.9044202413. The cubic root of 81052288 is about 432.7679527272.

The spelling of 81052288 in words is "eighty-one million, fifty-two thousand, two hundred eighty-eight".

Divisors: 1 2 4 8 16 32 64 128 633221 1266442 2532884 5065768 10131536 20263072 40526144 81052288