128886643 has 8 divisors (see below), whose sum is σ = 136169280. Its totient is φ = 121793280.

The previous prime is 128886631. The next prime is 128886647. The reversal of 128886643 is 346688821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128886643 is a prime.

It is a super-2 number, since 2×128886643² = 33223533487618898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128886593 and 128886602.

It is not an unprimeable number, because it can be changed into a prime (128886647) 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, 45918 + ... + 48643.

It is an arithmetic number, because the mean of its divisors is an integer number (17021160).

Almost surely, 2^128886643 is an apocalyptic number.

128886643 is a deficient number, since it is larger than the sum of its proper divisors (7282637).

128886643 is an equidigital number, since it uses as much as digits as its factorization.

128886643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94637.

The product of its digits is 442368, while the sum is 46.

The square root of 128886643 is about 11352.8253311676. The cubic root of 128886643 is about 505.1293894511.

The spelling of 128886643 in words is "one hundred twenty-eight million, eight hundred eighty-six thousand, six hundred forty-three".