678774212 has 6 divisors (see below), whose sum is σ = 1187854878. Its totient is φ = 339387104.

The previous prime is 678774211. The next prime is 678774247. The reversal of 678774212 is 212477876.

It can be written as a sum of positive squares in only one way, i.e., 644855236 + 33918976 = 25394^2 + 5824^2 .

It is not an unprimeable number, because it can be changed into a prime (678774211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84846773 + ... + 84846780.

It is an arithmetic number, because the mean of its divisors is an integer number (197975813).

Almost surely, 2^678774212 is an apocalyptic number.

It is an amenable number.

678774212 is a deficient number, since it is larger than the sum of its proper divisors (509080666).

678774212 is a wasteful number, since it uses less digits than its factorization.

678774212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169693557 (or 169693555 counting only the distinct ones).

The product of its digits is 263424, while the sum is 44.

The square root of 678774212 is about 26053.2956072739. The cubic root of 678774212 is about 878.8372263170.

The spelling of 678774212 in words is "six hundred seventy-eight million, seven hundred seventy-four thousand, two hundred twelve".