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12528637893 = 327057197261
BaseRepresentation
bin10111010101100001…
…11101011111000101
31012100010211202012200
423222300331133011
5201124312403033
65431112105113
7622320444042
oct135260753705
935303752180
1012528637893
11534a0a90a2
122517995199
131248835905
1486bd0a1c9
154d4d94013
hex2eac3d7c5

12528637893 has 12 divisors (see below), whose sum is σ = 18099577548. Its totient is φ = 8351199360.

The previous prime is 12528637841. The next prime is 12528637897. The reversal of 12528637893 is 39873682521.

12528637893 is a `hidden beast` number, since 1 + 2 + 528 + 6 + 37 + 89 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9736360929 + 2792276964 = 98673^2 + 52842^2 .

It is not a de Polignac number, because 12528637893 - 28 = 12528637637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12528637897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35118 + ... + 162143.

It is an arithmetic number, because the mean of its divisors is an integer number (1508298129).

Almost surely, 212528637893 is an apocalyptic number.

It is an amenable number.

12528637893 is a deficient number, since it is larger than the sum of its proper divisors (5570939655).

12528637893 is a wasteful number, since it uses less digits than its factorization.

12528637893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204324 (or 204321 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 12528637893 in words is "twelve billion, five hundred twenty-eight million, six hundred thirty-seven thousand, eight hundred ninety-three".

Divisors: 1 3 9 7057 21171 63513 197261 591783 1775349 1392070877 4176212631 12528637893