67856978 has 8 divisors (see below), whose sum is σ = 116326272. Its totient is φ = 29081556.

The previous prime is 67856977. The next prime is 67856981. The reversal of 67856978 is 87965876.

It is a happy number.

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 (67856977) 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, 2423450 + ... + 2423477.

It is an arithmetic number, because the mean of its divisors is an integer number (14540784).

Almost surely, 2^67856978 is an apocalyptic number.

67856978 is a deficient number, since it is larger than the sum of its proper divisors (48469294).

67856978 is a wasteful number, since it uses less digits than its factorization.

67856978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4846936.

The product of its digits is 5080320, while the sum is 56.

The square root of 67856978 is about 8237.5347040240. The cubic root of 67856978 is about 407.8791492963.

The spelling of 67856978 in words is "sixty-seven million, eight hundred fifty-six thousand, nine hundred seventy-eight".