128459686 has 4 divisors (see below), whose sum is σ = 192689532. Its totient is φ = 64229842.

The previous prime is 128459677. The next prime is 128459689. The reversal of 128459686 is 686954821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128459689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32114920 + ... + 32114923.

It is an arithmetic number, because the mean of its divisors is an integer number (48172383).

Almost surely, 2^128459686 is an apocalyptic number.

128459686 is a deficient number, since it is larger than the sum of its proper divisors (64229846).

128459686 is an equidigital number, since it uses as much as digits as its factorization.

128459686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64229845.

The product of its digits is 829440, while the sum is 49.

The square root of 128459686 is about 11334.0057349553. The cubic root of 128459686 is about 504.5709992561.

The spelling of 128459686 in words is "one hundred twenty-eight million, four hundred fifty-nine thousand, six hundred eighty-six".