128199898 has 16 divisors (see below), whose sum is σ = 197267400. Its totient is φ = 62460736.

The previous prime is 128199893. The next prime is 128199937. The reversal of 128199898 is 898991821.

It can be written as a sum of positive squares in 4 ways, for example, as 119749249 + 8450649 = 10943^2 + 2907^2 .

It is not an unprimeable number, because it can be changed into a prime (128199893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11736 + ... + 19852.

Almost surely, 2^128199898 is an apocalyptic number.

128199898 is a deficient number, since it is larger than the sum of its proper divisors (69067502).

128199898 is a wasteful number, since it uses less digits than its factorization.

128199898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8321.

The product of its digits is 746496, while the sum is 55.

The square root of 128199898 is about 11322.5393794855. The cubic root of 128199898 is about 504.2306331910.

The spelling of 128199898 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, eight hundred ninety-eight".