128689064 has 16 divisors (see below), whose sum is σ = 275762400. Its totient is φ = 55152432.

The previous prime is 128689061. The next prime is 128689073. The reversal of 128689064 is 460986821.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (128689061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148954 + ... + 1149065.

It is an arithmetic number, because the mean of its divisors is an integer number (17235150).

Almost surely, 2^128689064 is an apocalyptic number.

128689064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128689064 is an abundant number, since it is smaller than the sum of its proper divisors (147073336).

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

128689064 is a wasteful number, since it uses less digits than its factorization.

128689064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298032 (or 2298028 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 128689064 is about 11344.1202391371. The cubic root of 128689064 is about 504.8711418442.

The spelling of 128689064 in words is "one hundred twenty-eight million, six hundred eighty-nine thousand, sixty-four".