128366783 has 4 divisors (see below), whose sum is σ = 128530680. Its totient is φ = 128202888.

The previous prime is 128366773. The next prime is 128366827. The reversal of 128366783 is 387663821.

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 128366783 - 2⁴ = 128366767 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 (128366773) 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, 80768 + ... + 82341.

It is an arithmetic number, because the mean of its divisors is an integer number (32132670).

Almost surely, 2^128366783 is an apocalyptic number.

128366783 is a deficient number, since it is larger than the sum of its proper divisors (163897).

128366783 is an equidigital number, since it uses as much as digits as its factorization.

128366783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163896.

The product of its digits is 290304, while the sum is 44.

The square root of 128366783 is about 11329.9065750782. The cubic root of 128366783 is about 504.4493334222.

The spelling of 128366783 in words is "one hundred twenty-eight million, three hundred sixty-six thousand, seven hundred eighty-three".