128858040 has 144 divisors (see below), whose sum is σ = 435759480. Its totient is φ = 34292160.

The previous prime is 128858021. The next prime is 128858053. The reversal of 128858040 is 40858821.

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 = 128857986 and 128858004.

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 35 ways as a sum of consecutive naturals, for example, 262195 + ... + 262685.

Almost surely, 2^128858040 is an apocalyptic number.

128858040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128858040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217879740).

128858040 is an abundant number, since it is smaller than the sum of its proper divisors (306901440).

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

128858040 is an frugal number, since it uses more digits than its factorization.

128858040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 128858040 is about 11351.5655307979. The cubic root of 128858040 is about 505.0920199597.

The spelling of 128858040 in words is "one hundred twenty-eight million, eight hundred fifty-eight thousand, forty".