678445447684 has 27 divisors (see below), whose sum is σ = 1192488514581. Its totient is φ = 337740927120.

The previous prime is 678445447643. The next prime is 678445447709. The reversal of 678445447684 is 486744544876.

The square root of 678445447684 is 823678.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 44638393284 + 633807054400 = 211278^2 + 796120^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 443137999 + ... + 443139529.

Almost surely, 2^678445447684 is an apocalyptic number.

678445447684 is the 823678-th square number.

It is an amenable number.

678445447684 is a deficient number, since it is larger than the sum of its proper divisors (514043066897).

678445447684 is an frugal number, since it uses more digits than its factorization.

678445447684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604 (or 1802 counting only the distinct ones).

The product of its digits is 578027520, while the sum is 67.

The spelling of 678445447684 in words is "six hundred seventy-eight billion, four hundred forty-five million, four hundred forty-seven thousand, six hundred eighty-four".