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128645294 = 264322647
BaseRepresentation
bin1111010101011…
…11100010101110
322222001212011112
413222233202232
5230413122134
620433152022
73121316111
oct752574256
9288055145
10128645294
1166687128
12370bb612
1320862c9b
141312a578
15b4621ce
hex7aaf8ae

128645294 has 4 divisors (see below), whose sum is σ = 192967944. Its totient is φ = 64322646.

The previous prime is 128645267. The next prime is 128645299. The reversal of 128645294 is 492546821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 492546821 = 1337888217.

It is a super-2 number, since 2×1286452942 = 33099223336692872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128645299) 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 as a sum of consecutive naturals, namely, 32161322 + ... + 32161325.

It is an arithmetic number, because the mean of its divisors is an integer number (48241986).

Almost surely, 2128645294 is an apocalyptic number.

128645294 is a deficient number, since it is larger than the sum of its proper divisors (64322650).

128645294 is an equidigital number, since it uses as much as digits as its factorization.

128645294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64322649.

The product of its digits is 138240, while the sum is 41.

The square root of 128645294 is about 11342.1908818358. The cubic root of 128645294 is about 504.8138960689.

The spelling of 128645294 in words is "one hundred twenty-eight million, six hundred forty-five thousand, two hundred ninety-four".

Divisors: 1 2 64322647 128645294