678442647 has 8 divisors (see below), whose sum is σ = 957801456. Its totient is φ = 425689472.

The previous prime is 678442637. The next prime is 678442651. The reversal of 678442647 is 746244876.

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

It is a cyclic number.

It is not a de Polignac number, because 678442647 - 2⁴ = 678442631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678442596 and 678442605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678442637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6651348 + ... + 6651449.

It is an arithmetic number, because the mean of its divisors is an integer number (119725182).

Almost surely, 2^678442647 is an apocalyptic number.

678442647 is a deficient number, since it is larger than the sum of its proper divisors (279358809).

678442647 is a wasteful number, since it uses less digits than its factorization.

678442647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13302817.

The product of its digits is 1806336, while the sum is 48.

The square root of 678442647 is about 26046.9316235137. The cubic root of 678442647 is about 878.6941060085.

The spelling of 678442647 in words is "six hundred seventy-eight million, four hundred forty-two thousand, six hundred forty-seven".