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BaseRepresentation
bin1010011110011…
…11011110001001
320010100211220102
411033033132021
5134444202414
612415335145
72114660414
oct517173611
9203324812
1087881609
1145674832
12255214b5
131528c96a
14b958b7b
hex53cf789

87881609 has 2 divisors, whose sum is σ = 87881610. Its totient is φ = 87881608.

The previous prime is 87881603. The next prime is 87881639. The reversal of 87881609 is 90618878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70476025 + 17405584 = 8395^2 + 4172^2 .

It is a cyclic number.

It is not a de Polignac number, because 87881609 - 212 = 87877513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87881603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43940804 + 43940805.

It is an arithmetic number, because the mean of its divisors is an integer number (43940805).

Almost surely, 287881609 is an apocalyptic number.

It is an amenable number.

87881609 is a deficient number, since it is larger than the sum of its proper divisors (1).

87881609 is an equidigital number, since it uses as much as digits as its factorization.

87881609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 87881609 is about 9374.5191343343. The cubic root of 87881609 is about 444.5964594836.

The spelling of 87881609 in words is "eighty-seven million, eight hundred eighty-one thousand, six hundred nine".