678067778 has 8 divisors (see below), whose sum is σ = 1038742272. Its totient is φ = 331820356.

The previous prime is 678067759. The next prime is 678067783. The reversal of 678067778 is 877760876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3606650 + ... + 3606837.

It is an arithmetic number, because the mean of its divisors is an integer number (129842784).

Almost surely, 2^678067778 is an apocalyptic number.

678067778 is a deficient number, since it is larger than the sum of its proper divisors (360674494).

678067778 is a wasteful number, since it uses less digits than its factorization.

678067778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7213536.

The product of its (nonzero) digits is 5531904, while the sum is 56.

The square root of 678067778 is about 26039.7345992620. The cubic root of 678067778 is about 878.5322373184.

The spelling of 678067778 in words is "six hundred seventy-eight million, sixty-seven thousand, seven hundred seventy-eight".