678915136 has 21 divisors (see below), whose sum is σ = 1347635989. Its totient is φ = 339353344.

The previous prime is 678915131. The next prime is 678915151. The reversal of 678915136 is 631519876.

It is a happy number.

The square root of 678915136 is 26056.

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., 581774400 + 97140736 = 24120^2 + 9856^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678915131) 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 in 2 ways as a sum of consecutive naturals, for example, 206820 + ... + 210076.

Almost surely, 2^678915136 is an apocalyptic number.

678915136 is the 26056-th square number.

It is an amenable number.

678915136 is a deficient number, since it is larger than the sum of its proper divisors (668720853).

678915136 is an frugal number, since it uses more digits than its factorization.

678915136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6526 (or 3259 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The cubic root of 678915136 is about 878.8980421646.

The spelling of 678915136 in words is "six hundred seventy-eight million, nine hundred fifteen thousand, one hundred thirty-six".