128321198 has 4 divisors (see below), whose sum is σ = 192481800. Its totient is φ = 64160598.

The previous prime is 128321197. The next prime is 128321243. The reversal of 128321198 is 891123821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128321191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32080298 + ... + 32080301.

It is an arithmetic number, because the mean of its divisors is an integer number (48120450).

Almost surely, 2^128321198 is an apocalyptic number.

128321198 is a deficient number, since it is larger than the sum of its proper divisors (64160602).

128321198 is an equidigital number, since it uses as much as digits as its factorization.

128321198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64160601.

The product of its digits is 6912, while the sum is 35.

The square root of 128321198 is about 11327.8946852449. The cubic root of 128321198 is about 504.3896138050.

The spelling of 128321198 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, one hundred ninety-eight".