128199850 has 12 divisors (see below), whose sum is σ = 238451814. Its totient is φ = 51279920.

The previous prime is 128199833. The next prime is 128199871. The reversal of 128199850 is 58991821.

It can be written as a sum of positive squares in 3 ways, for example, as 116359369 + 11840481 = 10787^2 + 3441^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128199797 and 128199806.

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, 1281949 + ... + 1282048.

Almost surely, 2^128199850 is an apocalyptic number.

128199850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128199850 is a deficient number, since it is larger than the sum of its proper divisors (110251964).

128199850 is a wasteful number, since it uses less digits than its factorization.

128199850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564009 (or 2564004 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 128199850 is about 11322.5372598195. The cubic root of 128199850 is about 504.2305702604.

The spelling of 128199850 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, eight hundred fifty".