678491574436 has 45 divisors (see below), whose sum is σ = 1286831517909. Its totient is φ = 313021459296.

The previous prime is 678491574421. The next prime is 678491574443. The reversal of 678491574436 is 634475194876.

The square root of 678491574436 is 823706.

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

It can be written as a sum of positive squares in 7 ways, for example, as 495601920100 + 182889654336 = 703990^2 + 427656^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 278411410 + ... + 278413846.

Almost surely, 2^678491574436 is an apocalyptic number.

678491574436 is the 823706-th square number.

It is an amenable number.

678491574436 is a deficient number, since it is larger than the sum of its proper divisors (608339943473).

678491574436 is an frugal number, since it uses more digits than its factorization.

678491574436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930 (or 2452 counting only the distinct ones).

The product of its digits is 121927680, while the sum is 64.

Multiplying 678491574436 by its sum of digits (64), we get a square (43423460763904 = 6589648²).

The spelling of 678491574436 in words is "six hundred seventy-eight billion, four hundred ninety-one million, five hundred seventy-four thousand, four hundred thirty-six".