128323819 has 8 divisors (see below), whose sum is σ = 138635280. Its totient is φ = 118075296.

The previous prime is 128323813. The next prime is 128323823. The reversal of 128323819 is 918323821.

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 128323819 - 2¹¹ = 128321771 is a prime.

It is a super-2 number, since 2×128323819² = 32934005045489522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128323813) 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, 11449 + ... + 19690.

It is an arithmetic number, because the mean of its divisors is an integer number (17329410).

Almost surely, 2^128323819 is an apocalyptic number.

128323819 is a deficient number, since it is larger than the sum of its proper divisors (10311461).

128323819 is a wasteful number, since it uses less digits than its factorization.

128323819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31469.

The product of its digits is 20736, while the sum is 37.

The square root of 128323819 is about 11328.0103725235. The cubic root of 128323819 is about 504.3930478861.

The spelling of 128323819 in words is "one hundred twenty-eight million, three hundred twenty-three thousand, eight hundred nineteen".