678578898922 has 4 divisors (see below), whose sum is σ = 1017868348386. Its totient is φ = 339289449460.

The previous prime is 678578898863. The next prime is 678578898941. The reversal of 678578898922 is 229898875876.

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

It can be written as a sum of positive squares in only one way, i.e., 490726869361 + 187852029561 = 700519^2 + 433419^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169644724729 + ... + 169644724732.

Almost surely, 2^678578898922 is an apocalyptic number.

678578898922 is a deficient number, since it is larger than the sum of its proper divisors (339289449464).

678578898922 is a wasteful number, since it uses less digits than its factorization.

678578898922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339289449463.

The product of its digits is 1950842880, while the sum is 79.

The spelling of 678578898922 in words is "six hundred seventy-eight billion, five hundred seventy-eight million, eight hundred ninety-eight thousand, nine hundred twenty-two".