128220686488 has 32 divisors (see below), whose sum is σ = 250885958400. Its totient is φ = 61318195488.

The previous prime is 128220686479. The next prime is 128220686501. The reversal of 128220686488 is 884686022821.

128220686488 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3950695 + ... + 3983017.

It is an arithmetic number, because the mean of its divisors is an integer number (7840186200).

Almost surely, 2^128220686488 is an apocalyptic number.

It is an amenable number.

128220686488 is a deficient number, since it is larger than the sum of its proper divisors (122665271912).

128220686488 is a wasteful number, since it uses less digits than its factorization.

128220686488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53911 (or 53907 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 55.

The spelling of 128220686488 in words is "one hundred twenty-eight billion, two hundred twenty million, six hundred eighty-six thousand, four hundred eighty-eight".