128200028 has 24 divisors (see below), whose sum is σ = 250440960. Its totient is φ = 56916720.

The previous prime is 128200021. The next prime is 128200123. The reversal of 128200028 is 820002821.

It is a junction number, because it is equal to n+sod(n) for n = 128199976 and 128200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128200021) 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, 31988 + ... + 35771.

It is an arithmetic number, because the mean of its divisors is an integer number (10435040).

Almost surely, 2^128200028 is an apocalyptic number.

It is an amenable number.

128200028 is a deficient number, since it is larger than the sum of its proper divisors (122240932).

128200028 is a wasteful number, since it uses less digits than its factorization.

128200028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67817 (or 67815 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 128200028 is about 11322.5451202457. The cubic root of 128200028 is about 504.2308036278.

Adding to 128200028 its reverse (820002821), we get a palindrome (948202849).

The spelling of 128200028 in words is "one hundred twenty-eight million, two hundred thousand, twenty-eight".