128632099 has 4 divisors (see below), whose sum is σ = 129812320. Its totient is φ = 127451880.

The previous prime is 128632093. The next prime is 128632111. The reversal of 128632099 is 990236821.

It is a happy number.

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 128632099 - 2⁵ = 128632067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128632093) 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, 589947 + ... + 590164.

It is an arithmetic number, because the mean of its divisors is an integer number (32453080).

Almost surely, 2^128632099 is an apocalyptic number.

128632099 is a deficient number, since it is larger than the sum of its proper divisors (1180221).

128632099 is a wasteful number, since it uses less digits than its factorization.

128632099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180220.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 128632099 is about 11341.6091891759. The cubic root of 128632099 is about 504.7966360850.

The spelling of 128632099 in words is "one hundred twenty-eight million, six hundred thirty-two thousand, ninety-nine".