678634 has 16 divisors (see below), whose sum is σ = 1124640. Its totient is φ = 304560.

The previous prime is 678631. The next prime is 678637. The reversal of 678634 is 436876.

It is an interprime number because it is at equal distance from previous prime (678631) and next prime (678637).

It is a d-powerful number, because it can be written as 6⁷ + 7⁶ + 6⁷ + 8 + 3⁴ + 4⁵ .

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 678634.

It is not an unprimeable number, because it can be changed into a prime (678631) 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, 2257 + ... + 2539.

It is an arithmetic number, because the mean of its divisors is an integer number (70290).

2⁶⁷⁸⁶³⁴ is an apocalyptic number.

678634 is a deficient number, since it is larger than the sum of its proper divisors (446006).

678634 is a wasteful number, since it uses less digits than its factorization.

678634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its digits is 24192, while the sum is 34.

The square root of 678634 is about 823.7924495891. The cubic root of 678634 is about 87.8776709379.

The spelling of 678634 in words is "six hundred seventy-eight thousand, six hundred thirty-four".