128685144 has 32 divisors (see below), whose sum is σ = 367672320. Its totient is φ = 36767136.

The previous prime is 128685133. The next prime is 128685169. The reversal of 128685144 is 441586821.

It is a super-3 number, since 3×128685144³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382824 + ... + 383159.

It is an arithmetic number, because the mean of its divisors is an integer number (11489760).

Almost surely, 2^128685144 is an apocalyptic number.

128685144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128685144 is an abundant number, since it is smaller than the sum of its proper divisors (238987176).

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

128685144 is a wasteful number, since it uses less digits than its factorization.

128685144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765999 (or 765995 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 128685144 is about 11343.9474610913. The cubic root of 128685144 is about 504.8660154957.

The spelling of 128685144 in words is "one hundred twenty-eight million, six hundred eighty-five thousand, one hundred forty-four".