67978 has 8 divisors (see below), whose sum is σ = 104580. Its totient is φ = 33120.

The previous prime is 67967. The next prime is 67979. The reversal of 67978 is 87976.

It can be written as a sum of positive squares in 2 ways, for example, as 64009 + 3969 = 253^2 + 63^2 .

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

It is not an unprimeable number, because it can be changed into a prime (67979) by changing a digit.

67978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333 + ... + 496.

2⁶⁷⁹⁷⁸ is an apocalyptic number.

67978 is a deficient number, since it is larger than the sum of its proper divisors (36602).

67978 is a wasteful number, since it uses less digits than its factorization.

67978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872.

The product of its digits is 21168, while the sum is 37.

The square root of 67978 is about 260.7259097213. The cubic root of 67978 is about 40.8121487595.

It can be divided in two parts, 679 and 78, that added together give a palindrome (757).

The spelling of 67978 in words is "sixty-seven thousand, nine hundred seventy-eight".