128321208 has 24 divisors (see below), whose sum is σ = 347536800. Its totient is φ = 42773712.

The previous prime is 128321197. The next prime is 128321243. The reversal of 128321208 is 802123821.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 891048 + ... + 891191.

It is an arithmetic number, because the mean of its divisors is an integer number (14480700).

Almost surely, 2^128321208 is an apocalyptic number.

128321208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128321208 is an abundant number, since it is smaller than the sum of its proper divisors (219215592).

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

128321208 is a wasteful number, since it uses less digits than its factorization.

128321208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782251 (or 1782244 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 128321208 is about 11327.8951266332. The cubic root of 128321208 is about 504.3896269073.

The spelling of 128321208 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, two hundred eight".