128030687 has 4 divisors (see below), whose sum is σ = 128054760. Its totient is φ = 128006616.

The previous prime is 128030677. The next prime is 128030699. The reversal of 128030687 is 786030821.

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

It is a cyclic number.

It is not a de Polignac number, because 128030687 - 2⁴ = 128030671 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 (128030647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137 + ... + 16002.

It is an arithmetic number, because the mean of its divisors is an integer number (32013690).

Almost surely, 2^128030687 is an apocalyptic number.

128030687 is a deficient number, since it is larger than the sum of its proper divisors (24073).

128030687 is an equidigital number, since it uses as much as digits as its factorization.

128030687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24072.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 128030687 is about 11315.0646043229. The cubic root of 128030687 is about 504.0086909037.

The spelling of 128030687 in words is "one hundred twenty-eight million, thirty thousand, six hundred eighty-seven".