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128523707 = 13131163463
BaseRepresentation
bin1111010100100…
…01110110111011
322221211200101022
413222101312323
5230400224312
620430413055
73120301454
oct752216673
9287750338
10128523707
1166603844
123706118b
132081c840
14130d812b
15b43b172
hex7a91dbb

128523707 has 16 divisors (see below), whose sum is σ = 140625408. Its totient is φ = 116756640.

The previous prime is 128523691. The next prime is 128523713. The reversal of 128523707 is 707325821.

It is not a de Polignac number, because 128523707 - 24 = 128523691 is a prime.

It is a super-2 number, since 2×1285237072 = 33036686522043698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128525707) 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 15 ways as a sum of consecutive naturals, for example, 277358 + ... + 277820.

It is an arithmetic number, because the mean of its divisors is an integer number (8789088).

Almost surely, 2128523707 is an apocalyptic number.

128523707 is a deficient number, since it is larger than the sum of its proper divisors (12101701).

128523707 is a wasteful number, since it uses less digits than its factorization.

128523707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 128523707 is about 11336.8296714734. The cubic root of 128523707 is about 504.6548070667.

The spelling of 128523707 in words is "one hundred twenty-eight million, five hundred twenty-three thousand, seven hundred seven".

Divisors: 1 13 131 163 463 1703 2119 6019 21353 60653 75469 277589 788489 981097 9886439 128523707