678722746 has 16 divisors (see below), whose sum is σ = 1126032264. Its totient is φ = 304789824.

The previous prime is 678722729. The next prime is 678722749. The reversal of 678722746 is 647227876.

It can be written as a sum of positive squares in 4 ways, for example, as 442639521 + 236083225 = 21039^2 + 15365^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 678722746.

It is not an unprimeable number, because it can be changed into a prime (678722749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351805 + ... + 353728.

Almost surely, 2^678722746 is an apocalyptic number.

678722746 is a deficient number, since it is larger than the sum of its proper divisors (447309518).

678722746 is a wasteful number, since it uses less digits than its factorization.

678722746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705585.

The product of its digits is 1580544, while the sum is 49.

The square root of 678722746 is about 26052.3078824123. The cubic root of 678722746 is about 878.8150140314.

The spelling of 678722746 in words is "six hundred seventy-eight million, seven hundred twenty-two thousand, seven hundred forty-six".