128489420 has 24 divisors (see below), whose sum is σ = 278533248. Its totient is φ = 49737600.

The previous prime is 128489411. The next prime is 128489441. The reversal of 128489420 is 24984821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103001 + ... + 104240.

It is an arithmetic number, because the mean of its divisors is an integer number (11605552).

Almost surely, 2^128489420 is an apocalyptic number.

128489420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128489420 is an abundant number, since it is smaller than the sum of its proper divisors (150043828).

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

128489420 is a wasteful number, since it uses less digits than its factorization.

128489420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207281 (or 207279 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 128489420 is about 11335.3173753539. The cubic root of 128489420 is about 504.6099265314.

The spelling of 128489420 in words is "one hundred twenty-eight million, four hundred eighty-nine thousand, four hundred twenty".