6428333389 has 4 divisors (see below), whose sum is σ = 6428493756. Its totient is φ = 6428173024.

The previous prime is 6428333299. The next prime is 6428333399. The reversal of 6428333389 is 9833338246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9833338246 = 2 ⋅4916669123.

It can be written as a sum of positive squares in 2 ways, for example, as 1795216900 + 4633116489 = 42370^2 + 68067^2 .

It is a cyclic number.

It is not a de Polignac number, because 6428333389 - 2⁹ = 6428332877 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6428333399) 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, 38607 + ... + 119779.

It is an arithmetic number, because the mean of its divisors is an integer number (1607123439).

Almost surely, 2^6428333389 is an apocalyptic number.

It is an amenable number.

6428333389 is a deficient number, since it is larger than the sum of its proper divisors (160367).

6428333389 is an equidigital number, since it uses as much as digits as its factorization.

6428333389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160366.

The product of its digits is 2239488, while the sum is 49.

The square root of 6428333389 is about 80176.8881224508. Note that the first 3 decimals coincide. The cubic root of 6428333389 is about 1859.3713323220.

The spelling of 6428333389 in words is "six billion, four hundred twenty-eight million, three hundred thirty-three thousand, three hundred eighty-nine".