128578140 has 72 divisors (see below), whose sum is σ = 412972560. Its totient is φ = 32269824.

The previous prime is 128578129. The next prime is 128578181. The reversal of 128578140 is 41875821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 128578095 and 128578104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17950 + ... + 24069.

It is an arithmetic number, because the mean of its divisors is an integer number (5735730).

Almost surely, 2^128578140 is an apocalyptic number.

128578140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128578140 is an abundant number, since it is smaller than the sum of its proper divisors (284394420).

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

128578140 is a wasteful number, since it uses less digits than its factorization.

128578140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42051 (or 42046 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 128578140 is about 11339.2301325972. The cubic root of 128578140 is about 504.7260416495.

It can be divided in two parts, 1285781 and 40, that added together give a palindrome (1285821).

The spelling of 128578140 in words is "one hundred twenty-eight million, five hundred seventy-eight thousand, one hundred forty".