7678 has 8 divisors (see below), whose sum is σ = 12600. Its totient is φ = 3480.

The previous prime is 7673. The next prime is 7681. The reversal of 7678 is 8767.

7678 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7673) 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 3 ways as a sum of consecutive naturals, for example, 153 + ... + 196.

It is an arithmetic number, because the mean of its divisors is an integer number (1575).

2⁷⁶⁷⁸ is an apocalyptic number.

7678 is a deficient number, since it is larger than the sum of its proper divisors (4922).

7678 is a wasteful number, since it uses less digits than its factorization.

7678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362.

The product of its digits is 2352, while the sum is 28.

The square root of 7678 is about 87.6241975712. The cubic root of 7678 is about 19.7279837987.

Subtracting 7678 from its reverse (8767), we obtain a square (1089 = 33²).

The spelling of 7678 in words is "seven thousand, six hundred seventy-eight".