128139651387 has 24 divisors (see below), whose sum is σ = 201965100480. Its totient is φ = 77641904880.

The previous prime is 128139651379. The next prime is 128139651389. The reversal of 128139651387 is 783156931821.

128139651387 is a `hidden beast` number, since 1 + 28 + 13 + 96 + 513 + 8 + 7 = 666.

It is not a de Polignac number, because 128139651387 - 2³ = 128139651379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128139651389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269688 + ... + 573594.

It is an arithmetic number, because the mean of its divisors is an integer number (8415212520).

Almost surely, 2^128139651387 is an apocalyptic number.

128139651387 is a deficient number, since it is larger than the sum of its proper divisors (73825449093).

128139651387 is a wasteful number, since it uses less digits than its factorization.

128139651387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308183 (or 308180 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 128139651387 in words is "one hundred twenty-eight billion, one hundred thirty-nine million, six hundred fifty-one thousand, three hundred eighty-seven".