8239078385 has 4 divisors (see below), whose sum is σ = 9886894068. Its totient is φ = 6591262704.

The previous prime is 8239078343. The next prime is 8239078387. The reversal of 8239078385 is 5838709328.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5744275681 + 2494802704 = 75791^2 + 49948^2 .

It is a cyclic number.

It is not a de Polignac number, because 8239078385 - 2¹² = 8239074289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8239078387) 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, 823907834 + ... + 823907843.

It is an arithmetic number, because the mean of its divisors is an integer number (2471723517).

Almost surely, 2^8239078385 is an apocalyptic number.

It is an amenable number.

8239078385 is a deficient number, since it is larger than the sum of its proper divisors (1647815683).

8239078385 is a wasteful number, since it uses less digits than its factorization.

8239078385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647815682.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The square root of 8239078385 is about 90769.3692001878. The cubic root of 8239078385 is about 2019.7279626633.

The spelling of 8239078385 in words is "eight billion, two hundred thirty-nine million, seventy-eight thousand, three hundred eighty-five".