128289978 has 24 divisors (see below), whose sum is σ = 283877568. Its totient is φ = 41853192.

The previous prime is 128289961. The next prime is 128289983. The reversal of 128289978 is 879982821.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74976 + ... + 76667.

It is an arithmetic number, because the mean of its divisors is an integer number (11828232).

Almost surely, 2^128289978 is an apocalyptic number.

128289978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

128289978 is an abundant number, since it is smaller than the sum of its proper divisors (155587590).

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

128289978 is a wasteful number, since it uses less digits than its factorization.

128289978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151698 (or 151695 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 128289978 is about 11326.5165871948. The cubic root of 128289978 is about 504.3487052069.

The spelling of 128289978 in words is "one hundred twenty-eight million, two hundred eighty-nine thousand, nine hundred seventy-eight".