66478 has 8 divisors (see below), whose sum is σ = 102168. Its totient is φ = 32424.

The previous prime is 66467. The next prime is 66491. The reversal of 66478 is 87466.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301 + ... + 472.

It is an arithmetic number, because the mean of its divisors is an integer number (12771).

2⁶⁶⁴⁷⁸ is an apocalyptic number.

66478 is a deficient number, since it is larger than the sum of its proper divisors (35690).

66478 is a wasteful number, since it uses less digits than its factorization.

66478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818.

The product of its digits is 8064, while the sum is 31.

The square root of 66478 is about 257.8332794656. The cubic root of 66478 is about 40.5097268717.

The spelling of 66478 in words is "sixty-six thousand, four hundred seventy-eight".