128840100 has 36 divisors (see below), whose sum is σ = 372778224. Its totient is φ = 34357280.

The previous prime is 128840099. The next prime is 128840141. The reversal of 128840100 is 1048821.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214434 + ... + 215033.

Almost surely, 2^128840100 is an apocalyptic number.

128840100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128840100 is an abundant number, since it is smaller than the sum of its proper divisors (243938124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128840100 is a wasteful number, since it uses less digits than its factorization.

128840100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429484 (or 429477 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 128840100 is about 11350.7753039165. The cubic root of 128840100 is about 505.0685787335.

Adding to 128840100 its reverse (1048821), we get a palindrome (129888921).

The spelling of 128840100 in words is "one hundred twenty-eight million, eight hundred forty thousand, one hundred".