678047987 has 2 divisors, whose sum is σ = 678047988. Its totient is φ = 678047986.

The previous prime is 678047969. The next prime is 678048029. The reversal of 678047987 is 789740876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678047987 - 2⁸ = 678047731 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (678067987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339023993 + 339023994.

It is an arithmetic number, because the mean of its divisors is an integer number (339023994).

Almost surely, 2^678047987 is an apocalyptic number.

678047987 is a deficient number, since it is larger than the sum of its proper divisors (1).

678047987 is an equidigital number, since it uses as much as digits as its factorization.

678047987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The square root of 678047987 is about 26039.3545810951. The cubic root of 678047987 is about 878.5236898932.

The spelling of 678047987 in words is "six hundred seventy-eight million, forty-seven thousand, nine hundred eighty-seven".