128816419 has 4 divisors (see below), whose sum is σ = 128987344. Its totient is φ = 128645496.

The previous prime is 128816417. The next prime is 128816423. The reversal of 128816419 is 914618821.

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 128816419 - 2¹ = 128816417 is a prime.

It is a super-2 number, since 2×128816419² = 33187339607967122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128816417) 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, 84327 + ... + 85840.

It is an arithmetic number, because the mean of its divisors is an integer number (32246836).

Almost surely, 2^128816419 is an apocalyptic number.

128816419 is a deficient number, since it is larger than the sum of its proper divisors (170925).

128816419 is an equidigital number, since it uses as much as digits as its factorization.

128816419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170924.

The product of its digits is 27648, while the sum is 40.

The square root of 128816419 is about 11349.7321113760. The cubic root of 128816419 is about 505.0376327215.

The spelling of 128816419 in words is "one hundred twenty-eight million, eight hundred sixteen thousand, four hundred nineteen".