65678 has 4 divisors (see below), whose sum is σ = 98520. Its totient is φ = 32838.

The previous prime is 65677. The next prime is 65687. The reversal of 65678 is 87656.

65678 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16418 + ... + 16421.

It is an arithmetic number, because the mean of its divisors is an integer number (24630).

2⁶⁵⁶⁷⁸ is an apocalyptic number.

65678 is a deficient number, since it is larger than the sum of its proper divisors (32842).

65678 is a wasteful number, since it uses less digits than its factorization.

65678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32841.

The product of its digits is 10080, while the sum is 32.

The square root of 65678 is about 256.2771936790. The cubic root of 65678 is about 40.3465718596.

The spelling of 65678 in words is "sixty-five thousand, six hundred seventy-eight".