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87553449 = 3231192
BaseRepresentation
bin1010011011111…
…11010110101001
320002202011202100
411031333112221
5134403202244
612404324013
72112122604
oct515772651
9202664670
1087553449
1145470225
12253a3609
13151a6499
14b8b133b
157a46b69
hex537f5a9

87553449 has 9 divisors (see below), whose sum is σ = 126506653. Its totient is φ = 58350252.

The previous prime is 87553447. The next prime is 87553469. The reversal of 87553449 is 94435578.

It can be divided in two parts, 87 and 553449, that added together give a square (553536 = 7442).

The square root of 87553449 is 9357.

It is a perfect power (a square), and thus also a powerful number.

87553449 is a `hidden beast` number, since 8 + 75 + 534 + 49 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 87553449 - 21 = 87553447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87553441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26512 + ... + 29630.

Almost surely, 287553449 is an apocalyptic number.

87553449 is the 9357-th square number.

87553449 is the 4679-th centered octagonal number.

It is an amenable number.

87553449 is a deficient number, since it is larger than the sum of its proper divisors (38953204).

87553449 is an frugal number, since it uses more digits than its factorization.

87553449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244 (or 3122 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The cubic root of 87553449 is about 444.0423778640.

The spelling of 87553449 in words is "eighty-seven million, five hundred fifty-three thousand, four hundred forty-nine".

Divisors: 1 3 9 3119 9357 28071 9728161 29184483 87553449