678390067895 has 4 divisors (see below), whose sum is σ = 814068081480. Its totient is φ = 542712054312.

The previous prime is 678390067841. The next prime is 678390067907. The reversal of 678390067895 is 598760093876.

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

It is a cyclic number.

It is not a de Polignac number, because 678390067895 - 2¹⁶ = 678390002359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67839006785 + ... + 67839006794.

It is an arithmetic number, because the mean of its divisors is an integer number (203517020370).

Almost surely, 2^678390067895 is an apocalyptic number.

678390067895 is a deficient number, since it is larger than the sum of its proper divisors (135678013585).

678390067895 is a wasteful number, since it uses less digits than its factorization.

678390067895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135678013584.

The product of its (nonzero) digits is 137168640, while the sum is 68.

The spelling of 678390067895 in words is "six hundred seventy-eight billion, three hundred ninety million, sixty-seven thousand, eight hundred ninety-five".