678047999 has 4 divisors (see below), whose sum is σ = 686217336. Its totient is φ = 669878664.

The previous prime is 678047987. The next prime is 678048029. The reversal of 678047999 is 999740876.

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-678047999 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 (678047939) 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, 4084544 + ... + 4084709.

It is an arithmetic number, because the mean of its divisors is an integer number (171554334).

Almost surely, 2^678047999 is an apocalyptic number.

678047999 is a deficient number, since it is larger than the sum of its proper divisors (8169337).

678047999 is an equidigital number, since it uses as much as digits as its factorization.

678047999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8169336.

The product of its (nonzero) digits is 6858432, while the sum is 59.

The square root of 678047999 is about 26039.3548115156. The cubic root of 678047999 is about 878.5236950759.

The spelling of 678047999 in words is "six hundred seventy-eight million, forty-seven thousand, nine hundred ninety-nine".