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128270557 is a prime number
BaseRepresentation
bin1111010010101…
…00000011011101
322221100211010101
413221110003131
5230314124212
620421141101
73115165432
oct751240335
9287324111
10128270557
1166450628
1236b5a791
132076154c
141306db89
15b3db157
hex7a540dd

128270557 has 2 divisors, whose sum is σ = 128270558. Its totient is φ = 128270556.

The previous prime is 128270551. The next prime is 128270561. The reversal of 128270557 is 755072821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105288121 + 22982436 = 10261^2 + 4794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-128270557 is a prime.

It is equal to p7285537 and since 128270557 and 7285537 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128270551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64135278 + 64135279.

It is an arithmetic number, because the mean of its divisors is an integer number (64135279).

Almost surely, 2128270557 is an apocalyptic number.

It is an amenable number.

128270557 is a deficient number, since it is larger than the sum of its proper divisors (1).

128270557 is an equidigital number, since it uses as much as digits as its factorization.

128270557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 128270557 is about 11325.6592302612. The cubic root of 128270557 is about 504.3232538799.

The spelling of 128270557 in words is "one hundred twenty-eight million, two hundred seventy thousand, five hundred fifty-seven".