678837946 has 4 divisors (see below), whose sum is σ = 1018256922. Its totient is φ = 339418972.

The previous prime is 678837919. The next prime is 678837959. The reversal of 678837946 is 649738876.

It is a happy number.

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., 355737321 + 323100625 = 18861^2 + 17975^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169709485 + ... + 169709488.

Almost surely, 2^678837946 is an apocalyptic number.

678837946 is a deficient number, since it is larger than the sum of its proper divisors (339418976).

678837946 is a wasteful number, since it uses less digits than its factorization.

678837946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339418975.

The product of its digits is 12192768, while the sum is 58.

The square root of 678837946 is about 26054.5187251655. The cubic root of 678837946 is about 878.8647318103.

The spelling of 678837946 in words is "six hundred seventy-eight million, eight hundred thirty-seven thousand, nine hundred forty-six".