128251212 has 12 divisors (see below), whose sum is σ = 299252856. Its totient is φ = 42750400.

The previous prime is 128251183. The next prime is 128251231. The reversal of 128251212 is 212152821.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5343789 + ... + 5343812.

It is an arithmetic number, because the mean of its divisors is an integer number (24937738).

Almost surely, 2^128251212 is an apocalyptic number.

128251212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128251212 is an abundant number, since it is smaller than the sum of its proper divisors (171001644).

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

128251212 is a wasteful number, since it uses less digits than its factorization.

128251212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10687608 (or 10687606 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 128251212 is about 11324.8051638869. The cubic root of 128251212 is about 504.2978995974.

The spelling of 128251212 in words is "one hundred twenty-eight million, two hundred fifty-one thousand, two hundred twelve".