128307686 has 16 divisors (see below), whose sum is σ = 208102608. Its totient is φ = 58980000.

The previous prime is 128307679. The next prime is 128307689. The reversal of 128307686 is 686703821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128307689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3305 + ... + 16356.

It is an arithmetic number, because the mean of its divisors is an integer number (13006413).

Almost surely, 2^128307686 is an apocalyptic number.

128307686 is a deficient number, since it is larger than the sum of its proper divisors (79794922).

128307686 is a wasteful number, since it uses less digits than its factorization.

128307686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19927.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 128307686 is about 11327.2982656943. The cubic root of 128307686 is about 504.3719093992.

The spelling of 128307686 in words is "one hundred twenty-eight million, three hundred seven thousand, six hundred eighty-six".