128420500026 has 64 divisors (see below), whose sum is σ = 318909604608. Its totient is φ = 33569399808.

The previous prime is 128420500009. The next prime is 128420500111. The reversal of 128420500026 is 620005024821.

It is a junction number, because it is equal to n+sod(n) for n = 128420499966 and 128420500002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 979021 + ... + 1102416.

It is an arithmetic number, because the mean of its divisors is an integer number (4982962572).

Almost surely, 2^128420500026 is an apocalyptic number.

128420500026 is an abundant number, since it is smaller than the sum of its proper divisors (190489104582).

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

128420500026 is a wasteful number, since it uses less digits than its factorization.

128420500026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081575.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 128420500026 its reverse (620005024821), we get a palindrome (748425524847).

The spelling of 128420500026 in words is "one hundred twenty-eight billion, four hundred twenty million, five hundred thousand, twenty-six".