678785378 has 8 divisors (see below), whose sum is σ = 1029618540. Its totient is φ = 335579200.

The previous prime is 678785377. The next prime is 678785389. The reversal of 678785378 is 873587876.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 678758809 + 26569 = 26053^2 + 163^2 .

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

It is not an unprimeable number, because it can be changed into a prime (678785377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1906523 + ... + 1906878.

Almost surely, 2^678785378 is an apocalyptic number.

678785378 is a deficient number, since it is larger than the sum of its proper divisors (350833162).

678785378 is a wasteful number, since it uses less digits than its factorization.

678785378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3813492.

The product of its digits is 15805440, while the sum is 59.

The square root of 678785378 is about 26053.5098979005. The cubic root of 678785378 is about 878.8420453189.

The spelling of 678785378 in words is "six hundred seventy-eight million, seven hundred eighty-five thousand, three hundred seventy-eight".