678635 has 4 divisors (see below), whose sum is σ = 814368. Its totient is φ = 542904.

The previous prime is 678631. The next prime is 678637. The reversal of 678635 is 536876.

It is a happy number.

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 678635 - 2² = 678631 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 678595 and 678604.

It is not an unprimeable number, because it can be changed into a prime (678631) 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, 67859 + ... + 67868.

It is an arithmetic number, because the mean of its divisors is an integer number (203592).

2⁶⁷⁸⁶³⁵ is an apocalyptic number.

678635 is a deficient number, since it is larger than the sum of its proper divisors (135733).

678635 is a wasteful number, since it uses less digits than its factorization.

678635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135732.

The product of its digits is 30240, while the sum is 35.

The square root of 678635 is about 823.7930565379. The cubic root of 678635 is about 87.8777141019.

The spelling of 678635 in words is "six hundred seventy-eight thousand, six hundred thirty-five".