128140920 has 128 divisors (see below), whose sum is σ = 434592000. Its totient is φ = 33575040.

The previous prime is 128140891. The next prime is 128140939. The reversal of 128140920 is 29041821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62715 + ... + 64725.

It is an arithmetic number, because the mean of its divisors is an integer number (3395250).

Almost surely, 2^128140920 is an apocalyptic number.

128140920 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 128140920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217296000).

128140920 is an abundant number, since it is smaller than the sum of its proper divisors (306451080).

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

128140920 is a wasteful number, since it uses less digits than its factorization.

128140920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090 (or 2080 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 128140920 is about 11319.9346287865. The cubic root of 128140920 is about 504.1532980389.

Subtracting from 128140920 its reverse (29041821), we obtain a palindrome (99099099).

The spelling of 128140920 in words is "one hundred twenty-eight million, one hundred forty thousand, nine hundred twenty".