678349565 has 8 divisors (see below), whose sum is σ = 814385880. Its totient is φ = 542435392.

The previous prime is 678349559. The next prime is 678349613. The reversal of 678349565 is 565943876.

It can be written as a sum of positive squares in 4 ways, for example, as 342324004 + 336025561 = 18502^2 + 18331^2 .

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 678349565 - 2⁶ = 678349501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17834 + ... + 40923.

It is an arithmetic number, because the mean of its divisors is an integer number (101798235).

Almost surely, 2^678349565 is an apocalyptic number.

It is an amenable number.

678349565 is a deficient number, since it is larger than the sum of its proper divisors (136036315).

678349565 is a wasteful number, since it uses less digits than its factorization.

678349565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61071.

The product of its digits is 5443200, while the sum is 53.

The square root of 678349565 is about 26045.1447490698. The cubic root of 678349565 is about 878.6539187031.

The spelling of 678349565 in words is "six hundred seventy-eight million, three hundred forty-nine thousand, five hundred sixty-five".