128670893 has 4 divisors (see below), whose sum is σ = 138568668. Its totient is φ = 118773120.

The previous prime is 128670889. The next prime is 128670923. The reversal of 128670893 is 398076821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 398076821 = 37 ⋅10758833.

It can be written as a sum of positive squares in 2 ways, for example, as 20448484 + 108222409 = 4522^2 + 10403^2 .

It is a cyclic number.

It is not a de Polignac number, because 128670893 - 2² = 128670889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128670823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4948868 + ... + 4948893.

It is an arithmetic number, because the mean of its divisors is an integer number (34642167).

Almost surely, 2^128670893 is an apocalyptic number.

128670893 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

128670893 is a deficient number, since it is larger than the sum of its proper divisors (9897775).

128670893 is an equidigital number, since it uses as much as digits as its factorization.

128670893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9897774.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 128670893 is about 11343.3193113832. The cubic root of 128670893 is about 504.8473779877.

The spelling of 128670893 in words is "one hundred twenty-eight million, six hundred seventy thousand, eight hundred ninety-three".