87134128615 has 4 divisors (see below), whose sum is σ = 104560954344. Its totient is φ = 69707302888.

The previous prime is 87134128597. The next prime is 87134128619. The reversal of 87134128615 is 51682143178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87134128615 - 2¹⁷ = 87133997543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87134128619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8713412857 + ... + 8713412866.

It is an arithmetic number, because the mean of its divisors is an integer number (26140238586).

Almost surely, 2^87134128615 is an apocalyptic number.

87134128615 is a deficient number, since it is larger than the sum of its proper divisors (17426825729).

87134128615 is a wasteful number, since it uses less digits than its factorization.

87134128615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17426825728.

The product of its digits is 322560, while the sum is 46.

The spelling of 87134128615 in words is "eighty-seven billion, one hundred thirty-four million, one hundred twenty-eight thousand, six hundred fifteen".