678740845 has 8 divisors (see below), whose sum is σ = 818624664. Its totient is φ = 540235584.

The previous prime is 678740731. The next prime is 678740849. The reversal of 678740845 is 548047876.

It is a happy number.

678740845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 355963689 + 322777156 = 18867^2 + 17966^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678740845 - 2¹⁵ = 678708077 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 (678740849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343554 + ... + 345523.

It is an arithmetic number, because the mean of its divisors is an integer number (102328083).

Almost surely, 2^678740845 is an apocalyptic number.

It is an amenable number.

678740845 is a deficient number, since it is larger than the sum of its proper divisors (139883819).

678740845 is a wasteful number, since it uses less digits than its factorization.

678740845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689279.

The product of its (nonzero) digits is 1505280, while the sum is 49.

The square root of 678740845 is about 26052.6552389579. The cubic root of 678740845 is about 878.8228255330.

The spelling of 678740845 in words is "six hundred seventy-eight million, seven hundred forty thousand, eight hundred forty-five".