128431886 has 16 divisors (see below), whose sum is σ = 212129280. Its totient is φ = 57831480.

The previous prime is 128431873. The next prime is 128431907. The reversal of 128431886 is 688134821.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 24926 + ... + 29633.

It is an arithmetic number, because the mean of its divisors is an integer number (13258080).

Almost surely, 2^128431886 is an apocalyptic number.

128431886 is a deficient number, since it is larger than the sum of its proper divisors (83697394).

128431886 is a wasteful number, since it uses less digits than its factorization.

128431886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54679.

The product of its digits is 73728, while the sum is 41.

The square root of 128431886 is about 11332.7792707703. The cubic root of 128431886 is about 504.5345985086.

The spelling of 128431886 in words is "one hundred twenty-eight million, four hundred thirty-one thousand, eight hundred eighty-six".