65978 has 8 divisors (see below), whose sum is σ = 108000. Its totient is φ = 29980.

The previous prime is 65963. The next prime is 65981. The reversal of 65978 is 87956.

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

It is a nialpdrome in base 12.

It is an unprimeable number.

65978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1478 + ... + 1521.

It is an arithmetic number, because the mean of its divisors is an integer number (13500).

2⁶⁵⁹⁷⁸ is an apocalyptic number.

65978 is a deficient number, since it is larger than the sum of its proper divisors (42022).

65978 is a wasteful number, since it uses less digits than its factorization.

65978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012.

The product of its digits is 15120, while the sum is 35.

The square root of 65978 is about 256.8618305627. The cubic root of 65978 is about 40.4079094405.

It can be divided in two parts, 659 and 78, that added together give a palindrome (737).

The spelling of 65978 in words is "sixty-five thousand, nine hundred seventy-eight".