66278 has 8 divisors (see below), whose sum is σ = 102720. Its totient is φ = 32040.

The previous prime is 66271. The next prime is 66293. The reversal of 66278 is 87266.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66271) by changing a digit.

66278 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, 473 + ... + 596.

It is an arithmetic number, because the mean of its divisors is an integer number (12840).

2⁶⁶²⁷⁸ is an apocalyptic number.

66278 is a deficient number, since it is larger than the sum of its proper divisors (36442).

66278 is a wasteful number, since it uses less digits than its factorization.

66278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102.

The product of its digits is 4032, while the sum is 29.

The square root of 66278 is about 257.4451397871. The cubic root of 66278 is about 40.4690613687.

The spelling of 66278 in words is "sixty-six thousand, two hundred seventy-eight".