128700012 has 24 divisors (see below), whose sum is σ = 343200256. Its totient is φ = 36771408.

The previous prime is 128700007. The next prime is 128700029. The reversal of 128700012 is 210007821.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 765988 + ... + 766155.

Almost surely, 2^128700012 is an apocalyptic number.

128700012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128700012 is an abundant number, since it is smaller than the sum of its proper divisors (214500244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128700012 is a wasteful number, since it uses less digits than its factorization.

128700012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532157 (or 1532155 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 128700012 is about 11344.6027695993. The cubic root of 128700012 is about 504.8854584519.

Adding to 128700012 its reverse (210007821), we get a palindrome (338707833).

The spelling of 128700012 in words is "one hundred twenty-eight million, seven hundred thousand, twelve".