128621198 has 24 divisors (see below), whose sum is σ = 204184368. Its totient is φ = 60651008.

The previous prime is 128621197. The next prime is 128621231. The reversal of 128621198 is 891126821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128621197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364190 + ... + 364542.

It is an arithmetic number, because the mean of its divisors is an integer number (8507682).

Almost surely, 2^128621198 is an apocalyptic number.

128621198 is a deficient number, since it is larger than the sum of its proper divisors (75563170).

128621198 is an equidigital number, since it uses as much as digits as its factorization.

128621198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 467 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 128621198 is about 11341.1286034504. The cubic root of 128621198 is about 504.7823759233.

The spelling of 128621198 in words is "one hundred twenty-eight million, six hundred twenty-one thousand, one hundred ninety-eight".