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128589749 = 541237689
BaseRepresentation
bin1111010101000…
…01111110110101
322221222000222022
413222201332311
5230404332444
620432042525
73120665141
oct752417665
9287860868
10128589749
1166649422
1237093445
1320843912
1413114221
15b4509ee
hex7aa1fb5

128589749 has 4 divisors (see below), whose sum is σ = 128827980. Its totient is φ = 128351520.

The previous prime is 128589691. The next prime is 128589761. The reversal of 128589749 is 947985821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70677649 + 57912100 = 8407^2 + 7610^2 .

It is a cyclic number.

It is not a de Polignac number, because 128589749 - 216 = 128524213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128589749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128589779) 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 3 ways as a sum of consecutive naturals, for example, 118304 + ... + 119385.

It is an arithmetic number, because the mean of its divisors is an integer number (32206995).

Almost surely, 2128589749 is an apocalyptic number.

It is an amenable number.

128589749 is a deficient number, since it is larger than the sum of its proper divisors (238231).

128589749 is an equidigital number, since it uses as much as digits as its factorization.

128589749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238230.

The product of its digits is 1451520, while the sum is 53.

The square root of 128589749 is about 11339.7420164658. The cubic root of 128589749 is about 504.7412313447.

The spelling of 128589749 in words is "one hundred twenty-eight million, five hundred eighty-nine thousand, seven hundred forty-nine".

Divisors: 1 541 237689 128589749