128705502 has 8 divisors (see below), whose sum is σ = 257411016. Its totient is φ = 42901832.

The previous prime is 128705501. The next prime is 128705513. The reversal of 128705502 is 205507821.

It is a sphenic number, since it is the product of 3 distinct primes.

128705502 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 128705502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128705501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10725453 + ... + 10725464.

It is an arithmetic number, because the mean of its divisors is an integer number (32176377).

Almost surely, 2^128705502 is an apocalyptic number.

128705502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128705502 is a wasteful number, since it uses less digits than its factorization.

128705502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21450922.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 128705502 is about 11344.8447323002. The cubic root of 128705502 is about 504.8926373731.

The spelling of 128705502 in words is "one hundred twenty-eight million, seven hundred five thousand, five hundred two".