128531686444 has 12 divisors (see below), whose sum is σ = 257063372944. Its totient is φ = 55085008464.

The previous prime is 128531686433. The next prime is 128531686483. The reversal of 128531686444 is 444686135821.

128531686444 is an admirable number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128531686391 and 128531686400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2295208659 + ... + 2295208714.

Almost surely, 2^128531686444 is an apocalyptic number.

128531686444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128531686444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128531686444 is a wasteful number, since it uses less digits than its factorization.

128531686444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590417384 (or 4590417382 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 52.

The spelling of 128531686444 in words is "one hundred twenty-eight billion, five hundred thirty-one million, six hundred eighty-six thousand, four hundred forty-four".