128567687 has 4 divisors (see below), whose sum is σ = 130675416. Its totient is φ = 126459960.

The previous prime is 128567657. The next prime is 128567689. The reversal of 128567687 is 786765821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786765821 = 1471 ⋅534851.

It is a cyclic number.

It is not a de Polignac number, because 128567687 - 2¹⁰ = 128566663 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 (128567689) 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, 1053773 + ... + 1053894.

It is an arithmetic number, because the mean of its divisors is an integer number (32668854).

Almost surely, 2^128567687 is an apocalyptic number.

128567687 is a deficient number, since it is larger than the sum of its proper divisors (2107729).

128567687 is an equidigital number, since it uses as much as digits as its factorization.

128567687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107728.

The product of its digits is 1128960, while the sum is 50.

The square root of 128567687 is about 11338.7692012846. The cubic root of 128567687 is about 504.7123637301.

The spelling of 128567687 in words is "one hundred twenty-eight million, five hundred sixty-seven thousand, six hundred eighty-seven".