678298878578 has 8 divisors (see below), whose sum is σ = 1077298218972. Its totient is φ = 319199472256.

The previous prime is 678298878571. The next prime is 678298878589. The reversal of 678298878578 is 875878892876.

It can be written as a sum of positive squares in 2 ways, for example, as 676363142569 + 1935736009 = 822413^2 + 43997^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 678298878496 and 678298878505.

It is not an unprimeable number, because it can be changed into a prime (678298878571) 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, 9974983475 + ... + 9974983542.

Almost surely, 2^678298878578 is an apocalyptic number.

678298878578 is a deficient number, since it is larger than the sum of its proper divisors (398999340394).

678298878578 is a wasteful number, since it uses less digits than its factorization.

678298878578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19949967036.

The product of its digits is 6069288960, while the sum is 83.

The spelling of 678298878578 in words is "six hundred seventy-eight billion, two hundred ninety-eight million, eight hundred seventy-eight thousand, five hundred seventy-eight".