678382165 has 4 divisors (see below), whose sum is σ = 814058604. Its totient is φ = 542705728.

The previous prime is 678382163. The next prime is 678382231. The reversal of 678382165 is 561283876.

678382165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 541632529 + 136749636 = 23273^2 + 11694^2 .

It is a cyclic number.

It is not a de Polignac number, because 678382165 - 2¹ = 678382163 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 (678382163) 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, 67838212 + ... + 67838221.

It is an arithmetic number, because the mean of its divisors is an integer number (203514651).

Almost surely, 2^678382165 is an apocalyptic number.

It is an amenable number.

678382165 is a deficient number, since it is larger than the sum of its proper divisors (135676439).

678382165 is a wasteful number, since it uses less digits than its factorization.

678382165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135676438.

The product of its digits is 483840, while the sum is 46.

The square root of 678382165 is about 26045.7705779652. The cubic root of 678382165 is about 878.6679938743.

The spelling of 678382165 in words is "six hundred seventy-eight million, three hundred eighty-two thousand, one hundred sixty-five".