128619823 has 4 divisors (see below), whose sum is σ = 130799880. Its totient is φ = 126439768.

The previous prime is 128619809. The next prime is 128619853. The reversal of 128619823 is 328916821.

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 128619823 - 2⁹ = 128619311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128619853) 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, 1089940 + ... + 1090057.

It is an arithmetic number, because the mean of its divisors is an integer number (32699970).

Almost surely, 2^128619823 is an apocalyptic number.

128619823 is a deficient number, since it is larger than the sum of its proper divisors (2180057).

128619823 is an equidigital number, since it uses as much as digits as its factorization.

128619823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180056.

The product of its digits is 41472, while the sum is 40.

The square root of 128619823 is about 11341.0679832192. The cubic root of 128619823 is about 504.7805771575.

The spelling of 128619823 in words is "one hundred twenty-eight million, six hundred nineteen thousand, eight hundred twenty-three".