128686100 has 36 divisors (see below), whose sum is σ = 285752544. Its totient is φ = 50275680.

The previous prime is 128686099. The next prime is 128686123. The reversal of 128686100 is 1686821.

It is a super-2 number, since 2×128686100² = 33120224666420000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 10664 + ... + 19263.

Almost surely, 2^128686100 is an apocalyptic number.

128686100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128686100 is an abundant number, since it is smaller than the sum of its proper divisors (157066444).

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

128686100 is a wasteful number, since it uses less digits than its factorization.

128686100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29984 (or 29977 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 128686100 is about 11343.9895980206. The cubic root of 128686100 is about 504.8672657066.

The spelling of 128686100 in words is "one hundred twenty-eight million, six hundred eighty-six thousand, one hundred".