128887812 has 36 divisors (see below), whose sum is σ = 344966076. Its totient is φ = 40435200.

The previous prime is 128887799. The next prime is 128887859. The reversal of 128887812 is 218788821.

It can be written as a sum of positive squares in 2 ways, for example, as 34292736 + 94595076 = 5856^2 + 9726^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×128887812² = 33224136164294688, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 104689 + ... + 105912.

It is an arithmetic number, because the mean of its divisors is an integer number (9582391).

Almost surely, 2^128887812 is an apocalyptic number.

128887812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128887812 is an abundant number, since it is smaller than the sum of its proper divisors (216078264).

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

128887812 is a wasteful number, since it uses less digits than its factorization.

128887812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210628 (or 210623 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 128887812 is about 11352.8768160321. The cubic root of 128887812 is about 505.1309166185.

The spelling of 128887812 in words is "one hundred twenty-eight million, eight hundred eighty-seven thousand, eight hundred twelve".