128321218 has 8 divisors (see below), whose sum is σ = 194185548. Its totient is φ = 63592704.

The previous prime is 128321197. The next prime is 128321243. The reversal of 128321218 is 812123821.

It can be written as a sum of positive squares in 2 ways, for example, as 128210329 + 110889 = 11323^2 + 333^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283671 + ... + 284122.

Almost surely, 2^128321218 is an apocalyptic number.

128321218 is a deficient number, since it is larger than the sum of its proper divisors (65864330).

128321218 is a wasteful number, since it uses less digits than its factorization.

128321218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567908.

The product of its digits is 1536, while the sum is 28.

The square root of 128321218 is about 11327.8955680214. The cubic root of 128321218 is about 504.3896400096.

The spelling of 128321218 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, two hundred eighteen".