128902 has 4 divisors (see below), whose sum is σ = 193356. Its totient is φ = 64450.

The previous prime is 128879. The next prime is 128903. The reversal of 128902 is 209821.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128903) by changing a digit.

128902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32224 + ... + 32227.

It is an arithmetic number, because the mean of its divisors is an integer number (48339).

2¹²⁸⁹⁰² is an apocalyptic number.

128902 is a deficient number, since it is larger than the sum of its proper divisors (64454).

128902 is an equidigital number, since it uses as much as digits as its factorization.

128902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64453.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 128902 is about 359.0292467195. The cubic root of 128902 is about 50.5149450914.

The spelling of 128902 in words is "one hundred twenty-eight thousand, nine hundred two".