128312920 has 32 divisors (see below), whose sum is σ = 289364400. Its totient is φ = 51207808.

The previous prime is 128312911. The next prime is 128312927. The reversal of 128312920 is 29213821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128312927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15246 + ... + 22114.

Almost surely, 2^128312920 is an apocalyptic number.

128312920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128312920 is an abundant number, since it is smaller than the sum of its proper divisors (161051480).

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

128312920 is a wasteful number, since it uses less digits than its factorization.

128312920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7347 (or 7343 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 128312920 is about 11327.5292981303. The cubic root of 128312920 is about 504.3787675144.

Subtracting from 128312920 its reverse (29213821), we obtain a palindrome (99099099).

It can be divided in two parts, 12831 and 2920, that added together give a palindrome (15751).

The spelling of 128312920 in words is "one hundred twenty-eight million, three hundred twelve thousand, nine hundred twenty".