678328987 has 4 divisors (see below), whose sum is σ = 775233136. Its totient is φ = 581424840.

The previous prime is 678328877. The next prime is 678328991. The reversal of 678328987 is 789823876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678328987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678328687) 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 3 ways as a sum of consecutive naturals, for example, 48452064 + ... + 48452077.

It is an arithmetic number, because the mean of its divisors is an integer number (193808284).

Almost surely, 2^678328987 is an apocalyptic number.

678328987 is a deficient number, since it is larger than the sum of its proper divisors (96904149).

678328987 is an equidigital number, since it uses as much as digits as its factorization.

678328987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96904148.

The product of its digits is 8128512, while the sum is 58.

The square root of 678328987 is about 26044.7497012354. The cubic root of 678328987 is about 878.6450338429.

The spelling of 678328987 in words is "six hundred seventy-eight million, three hundred twenty-eight thousand, nine hundred eighty-seven".