128888887 has 4 divisors (see below), whose sum is σ = 128991096. Its totient is φ = 128786680.

The previous prime is 128888869. The next prime is 128888891. The reversal of 128888887 is 788888821.

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 128888887 - 2²³ = 120500279 is a prime.

It is a super-2 number, since 2×128888887² = 33224690384197538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128888807) 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, 49189 + ... + 51742.

It is an arithmetic number, because the mean of its divisors is an integer number (32247774).

Almost surely, 2^128888887 is an apocalyptic number.

128888887 is a deficient number, since it is larger than the sum of its proper divisors (102209).

128888887 is a wasteful number, since it uses less digits than its factorization.

128888887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102208.

The product of its digits is 3670016, while the sum is 58.

The square root of 128888887 is about 11352.9241607614. The cubic root of 128888887 is about 505.1323209774.

The spelling of 128888887 in words is "one hundred twenty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-seven".