128711894 has 4 divisors (see below), whose sum is σ = 193067844. Its totient is φ = 64355946.

The previous prime is 128711881. The next prime is 128711939. The reversal of 128711894 is 498117821.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32177972 + ... + 32177975.

It is an arithmetic number, because the mean of its divisors is an integer number (48266961).

Almost surely, 2^128711894 is an apocalyptic number.

128711894 is a deficient number, since it is larger than the sum of its proper divisors (64355950).

128711894 is an equidigital number, since it uses as much as digits as its factorization.

128711894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64355949.

The product of its digits is 32256, while the sum is 41.

The square root of 128711894 is about 11345.1264426625. The cubic root of 128711894 is about 504.9009955248.

The spelling of 128711894 in words is "one hundred twenty-eight million, seven hundred eleven thousand, eight hundred ninety-four".