128685020 has 12 divisors (see below), whose sum is σ = 270238584. Its totient is φ = 51474000.

The previous prime is 128685017. The next prime is 128685031. The reversal of 128685020 is 20586821.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3217106 + ... + 3217145.

It is an arithmetic number, because the mean of its divisors is an integer number (22519882).

Almost surely, 2^128685020 is an apocalyptic number.

128685020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128685020 is an abundant number, since it is smaller than the sum of its proper divisors (141553564).

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

128685020 is a wasteful number, since it uses less digits than its factorization.

128685020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6434260 (or 6434258 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 128685020 is about 11343.9419956204. The cubic root of 128685020 is about 504.8658533340.

The spelling of 128685020 in words is "one hundred twenty-eight million, six hundred eighty-five thousand, twenty".