678890687 has 8 divisors (see below), whose sum is σ = 689678400. Its totient is φ = 668157984.

The previous prime is 678890677. The next prime is 678890717. The reversal of 678890687 is 786098876.

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

It is not a de Polignac number, because 678890687 - 2²⁸ = 410455231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678890617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11489 + ... + 38597.

It is an arithmetic number, because the mean of its divisors is an integer number (86209800).

Almost surely, 2^678890687 is an apocalyptic number.

678890687 is a deficient number, since it is larger than the sum of its proper divisors (10787713).

678890687 is a wasteful number, since it uses less digits than its factorization.

678890687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27505.

The product of its (nonzero) digits is 8128512, while the sum is 59.

The square root of 678890687 is about 26055.5308332031. The cubic root of 678890687 is about 878.8874917855.

The spelling of 678890687 in words is "six hundred seventy-eight million, eight hundred ninety thousand, six hundred eighty-seven".