678017738 has 16 divisors (see below), whose sum is σ = 1077761160. Its totient is φ = 319334400.

The previous prime is 678017707. The next prime is 678017761. The reversal of 678017738 is 837710876.

678017738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 229128769 + 448888969 = 15137^2 + 21187^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 678017692 and 678017701.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140183 + ... + 144938.

Almost surely, 2^678017738 is an apocalyptic number.

678017738 is a deficient number, since it is larger than the sum of its proper divisors (399743422).

678017738 is a wasteful number, since it uses less digits than its factorization.

678017738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285193.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 678017738 is about 26038.7737422483. The cubic root of 678017738 is about 878.5106254992.

The spelling of 678017738 in words is "six hundred seventy-eight million, seventeen thousand, seven hundred thirty-eight".