128499812 has 48 divisors (see below), whose sum is σ = 279888000. Its totient is φ = 50367744.

The previous prime is 128499809. The next prime is 128499823. The reversal of 128499812 is 218994821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11264 + ... + 19592.

It is an arithmetic number, because the mean of its divisors is an integer number (5831000).

Almost surely, 2^128499812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128499812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139944000).

128499812 is an abundant number, since it is smaller than the sum of its proper divisors (151388188).

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

128499812 is a wasteful number, since it uses less digits than its factorization.

128499812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8388 (or 8386 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 128499812 is about 11335.7757564271. The cubic root of 128499812 is about 504.6235301547.

The spelling of 128499812 in words is "one hundred twenty-eight million, four hundred ninety-nine thousand, eight hundred twelve".