128899993909627 has 4 divisors (see below), whose sum is σ = 128910970672960. Its totient is φ = 128889017146296.

The previous prime is 128899993909607. The next prime is 128899993909663. The reversal of 128899993909627 is 726909399998821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128899993909627 - 2⁴³ = 120103900887419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128899993909607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5488364052 + ... + 5488387537.

It is an arithmetic number, because the mean of its divisors is an integer number (32227742668240).

Almost surely, 2^{128899993909627} is an apocalyptic number.

128899993909627 is a deficient number, since it is larger than the sum of its proper divisors (10976763333).

128899993909627 is a wasteful number, since it uses less digits than its factorization.

128899993909627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10976763332.

The product of its (nonzero) digits is 17142160896, while the sum is 91.

The spelling of 128899993909627 in words is "one hundred twenty-eight trillion, eight hundred ninety-nine billion, nine hundred ninety-three million, nine hundred nine thousand, six hundred twenty-seven".