678488279615 has 16 divisors (see below), whose sum is σ = 820330108416. Its totient is φ = 538701108000.

The previous prime is 678488279593. The next prime is 678488279657. The reversal of 678488279615 is 516972884876.

It is a Cunningham number, because it is equal to 823704²-1.

It is not a de Polignac number, because 678488279615 - 2¹⁴ = 678488263231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411854 + ... + 1235556.

It is an arithmetic number, because the mean of its divisors is an integer number (51270631776).

Almost surely, 2^678488279615 is an apocalyptic number.

678488279615 is a deficient number, since it is larger than the sum of its proper divisors (141841828801).

678488279615 is a wasteful number, since it uses less digits than its factorization.

678488279615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824950.

The product of its digits is 325140480, while the sum is 71.

The spelling of 678488279615 in words is "six hundred seventy-eight billion, four hundred eighty-eight million, two hundred seventy-nine thousand, six hundred fifteen".