128436887 has 8 divisors (see below), whose sum is σ = 139309632. Its totient is φ = 117932800.

The previous prime is 128436883. The next prime is 128436901. The reversal of 128436887 is 788634821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128436887 - 2² = 128436883 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 (128436881) 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 7 ways as a sum of consecutive naturals, for example, 91439 + ... + 92832.

It is an arithmetic number, because the mean of its divisors is an integer number (17413704).

Almost surely, 2^128436887 is an apocalyptic number.

128436887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128436887 is a deficient number, since it is larger than the sum of its proper divisors (10872745).

128436887 is a wasteful number, since it uses less digits than its factorization.

128436887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184329.

The product of its digits is 516096, while the sum is 47.

The square root of 128436887 is about 11332.9999117621. Note that the first 4 decimals coincide. The cubic root of 128436887 is about 504.5411471025.

The spelling of 128436887 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, eight hundred eighty-seven".