678519047 has 4 divisors (see below), whose sum is σ = 679652400. Its totient is φ = 677385696.

The previous prime is 678519029. The next prime is 678519073. The reversal of 678519047 is 740915876.

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

It is a cyclic number.

It is not a de Polignac number, because 678519047 - 2¹² = 678514951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678518992 and 678519010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678519007) 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, 565778 + ... + 566975.

It is an arithmetic number, because the mean of its divisors is an integer number (169913100).

Almost surely, 2^678519047 is an apocalyptic number.

678519047 is a deficient number, since it is larger than the sum of its proper divisors (1133353).

678519047 is a wasteful number, since it uses less digits than its factorization.

678519047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133352.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 678519047 is about 26048.3981657222. The cubic root of 678519047 is about 878.7270882658.

The spelling of 678519047 in words is "six hundred seventy-eight million, five hundred nineteen thousand, forty-seven".