128158027812 has 18 divisors (see below), whose sum is σ = 323955014838. Its totient is φ = 42719342592.

The previous prime is 128158027787. The next prime is 128158027903. The reversal of 128158027812 is 218720851821.

It can be written as a sum of positive squares in only one way, i.e., 70445653056 + 57712374756 = 265416^2 + 240234^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×128158027812² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1779972573 + ... + 1779972644.

Almost surely, 2^128158027812 is an apocalyptic number.

128158027812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128158027812 is an abundant number, since it is smaller than the sum of its proper divisors (195796987026).

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

128158027812 is a wasteful number, since it uses less digits than its factorization.

128158027812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559945227 (or 3559945222 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The spelling of 128158027812 in words is "one hundred twenty-eight billion, one hundred fifty-eight million, twenty-seven thousand, eight hundred twelve".