128689002 has 48 divisors (see below), whose sum is σ = 313342848. Its totient is φ = 37873440.

The previous prime is 128688983. The next prime is 128689013. The reversal of 128689002 is 200986821.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6574 + ... + 17337.

It is an arithmetic number, because the mean of its divisors is an integer number (6527976).

Almost surely, 2^128689002 is an apocalyptic number.

128689002 is an abundant number, since it is smaller than the sum of its proper divisors (184653846).

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

128689002 is a wasteful number, since it uses less digits than its factorization.

128689002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23955 (or 23952 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 128689002 is about 11344.1175064436. The cubic root of 128689002 is about 504.8710607650.

The spelling of 128689002 in words is "one hundred twenty-eight million, six hundred eighty-nine thousand, two".