128932887391 has 8 divisors (see below), whose sum is σ = 160747496064. Its totient is φ = 100467184920.

The previous prime is 128932887389. The next prime is 128932887397. The reversal of 128932887391 is 193788239821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128932887391 - 2¹ = 128932887389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128932887397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837226465 + ... + 837226618.

It is an arithmetic number, because the mean of its divisors is an integer number (20093437008).

Almost surely, 2^128932887391 is an apocalyptic number.

128932887391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128932887391 is a deficient number, since it is larger than the sum of its proper divisors (31814608673).

128932887391 is a wasteful number, since it uses less digits than its factorization.

128932887391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674453101.

The product of its digits is 10450944, while the sum is 61.

The spelling of 128932887391 in words is "one hundred twenty-eight billion, nine hundred thirty-two million, eight hundred eighty-seven thousand, three hundred ninety-one".