128500015812 has 48 divisors (see below), whose sum is σ = 354482808960. Its totient is φ = 35448279552.

The previous prime is 128500015799. The next prime is 128500015843. The reversal of 128500015812 is 218510005821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26372773 + ... + 26377644.

It is an arithmetic number, because the mean of its divisors is an integer number (7385058520).

Almost surely, 2^128500015812 is an apocalyptic number.

128500015812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128500015812 is an abundant number, since it is smaller than the sum of its proper divisors (225982793148).

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

128500015812 is a wasteful number, since it uses less digits than its factorization.

128500015812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52750460 (or 52750458 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 33.

Subtracting 128500015812 from its reverse (218510005821), we obtain a palindrome (90009990009).

The spelling of 128500015812 in words is "one hundred twenty-eight billion, five hundred million, fifteen thousand, eight hundred twelve".