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128505645 = 32519150299
BaseRepresentation
bin1111010100011…
…01011100101101
322221210202121100
413222031130231
5230344140040
620430153313
73120165012
oct752153455
9287722540
10128505645
11665a1214
1237052839
1320814558
14130d1709
15b435b30
hex7a8d72d

128505645 has 24 divisors (see below), whose sum is σ = 234468000. Its totient is φ = 64928736.

The previous prime is 128505613. The next prime is 128505649. The reversal of 128505645 is 546505821.

128505645 is a `hidden beast` number, since 1 + 2 + 8 + 5 + 0 + 5 + 645 = 666.

It is not a de Polignac number, because 128505645 - 25 = 128505613 is a prime.

It is a super-3 number, since 3×1285056453 (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128505649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74295 + ... + 76004.

It is an arithmetic number, because the mean of its divisors is an integer number (9769500).

Almost surely, 2128505645 is an apocalyptic number.

128505645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128505645 is a deficient number, since it is larger than the sum of its proper divisors (105962355).

128505645 is a wasteful number, since it uses less digits than its factorization.

128505645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150329 (or 150326 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 128505645 is about 11336.0330362963. The cubic root of 128505645 is about 504.6311655083.

The spelling of 128505645 in words is "one hundred twenty-eight million, five hundred five thousand, six hundred forty-five".

Divisors: 1 3 5 9 15 19 45 57 95 171 285 855 150299 450897 751495 1352691 2254485 2855681 6763455 8567043 14278405 25701129 42835215 128505645