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72000647 is a prime number
BaseRepresentation
bin1000100101010…
…10010010000111
312000111000022122
410102222102013
5121413010042
611051120155
71532665265
oct422522207
9160430278
1072000647
1137708174
122014305b
1311bbc344
1497c3435
1564c37d2
hex44aa487

72000647 has 2 divisors, whose sum is σ = 72000648. Its totient is φ = 72000646.

The previous prime is 72000641. The next prime is 72000673. The reversal of 72000647 is 74600027.

It is an a-pointer prime, because the next prime (72000673) can be obtained adding 72000647 to its sum of digits (26).

It is a weak prime.

It is an emirp because it is prime and its reverse (74600027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72000647 - 26 = 72000583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72000641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36000323 + 36000324.

It is an arithmetic number, because the mean of its divisors is an integer number (36000324).

Almost surely, 272000647 is an apocalyptic number.

72000647 is a deficient number, since it is larger than the sum of its proper divisors (1).

72000647 is an equidigital number, since it uses as much as digits as its factorization.

72000647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 72000647 is about 8485.3194989935. The cubic root of 72000647 is about 416.0180107309.

The spelling of 72000647 in words is "seventy-two million, six hundred forty-seven", and thus it is an aban number.