87134128618 has 12 divisors (see below), whose sum is σ = 132878972070. Its totient is φ = 42852846480.

The previous prime is 87134128597. The next prime is 87134128619. The reversal of 87134128618 is 81682143178.

It can be written as a sum of positive squares in 3 ways, for example, as 22766886769 + 64367241849 = 150887^2 + 253707^2 .

It is not an unprimeable number, because it can be changed into a prime (87134128619) 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 5 ways as a sum of consecutive naturals, for example, 5846773 + ... + 5861656.

Almost surely, 2^87134128618 is an apocalyptic number.

87134128618 is a deficient number, since it is larger than the sum of its proper divisors (45744843452).

87134128618 is a wasteful number, since it uses less digits than its factorization.

87134128618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11708553 (or 11708492 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The spelling of 87134128618 in words is "eighty-seven billion, one hundred thirty-four million, one hundred twenty-eight thousand, six hundred eighteen".