678407643 has 24 divisors (see below), whose sum is σ = 1051268400. Its totient is φ = 436671648.

The previous prime is 678407641. The next prime is 678407647. The reversal of 678407643 is 346704876.

It is not a de Polignac number, because 678407643 - 2¹ = 678407641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678407641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41088 + ... + 55181.

It is an arithmetic number, because the mean of its divisors is an integer number (43802850).

Almost surely, 2^678407643 is an apocalyptic number.

678407643 is a deficient number, since it is larger than the sum of its proper divisors (372860757).

678407643 is an equidigital number, since it uses as much as digits as its factorization.

678407643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96313 (or 96301 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The square root of 678407643 is about 26046.2596738956. The cubic root of 678407643 is about 878.6789937817.

It can be divided in two parts, 678 and 407643, that added together give a square (408321 = 639²).

The spelling of 678407643 in words is "six hundred seventy-eight million, four hundred seven thousand, six hundred forty-three".