128857740 has 72 divisors (see below), whose sum is σ = 396606000. Its totient is φ = 31236480.

The previous prime is 128857727. The next prime is 128857763. The reversal of 128857740 is 47758821.

It is a junction number, because it is equal to n+sod(n) for n = 128857692 and 128857701.

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, 1615 + ... + 16134.

Almost surely, 2^128857740 is an apocalyptic number.

128857740 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 128857740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198303000).

128857740 is an abundant number, since it is smaller than the sum of its proper divisors (267748260).

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

128857740 is a wasteful number, since it uses less digits than its factorization.

128857740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17783 (or 17770 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 42.

The square root of 128857740 is about 11351.5523167539. The cubic root of 128857740 is about 505.0916279839.

The spelling of 128857740 in words is "one hundred twenty-eight million, eight hundred fifty-seven thousand, seven hundred forty".