678629 has 8 divisors (see below), whose sum is σ = 802560. Its totient is φ = 561456.

The previous prime is 678611. The next prime is 678631. The reversal of 678629 is 926876.

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

It is not a de Polignac number, because 678629 - 2¹² = 674533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678592 and 678601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1469 + ... + 1874.

It is an arithmetic number, because the mean of its divisors is an integer number (100320).

2⁶⁷⁸⁶²⁹ is an apocalyptic number.

It is an amenable number.

678629 is a deficient number, since it is larger than the sum of its proper divisors (123931).

678629 is a wasteful number, since it uses less digits than its factorization.

678629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379.

The product of its digits is 36288, while the sum is 38.

The square root of 678629 is about 823.7894148385. The cubic root of 678629 is about 87.8774551174.

The spelling of 678629 in words is "six hundred seventy-eight thousand, six hundred twenty-nine".