66893278 has 8 divisors (see below), whose sum is σ = 100374768. Its totient is φ = 33435024.

The previous prime is 66893273. The next prime is 66893279. The reversal of 66893278 is 87239866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66893273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7375 + ... + 13717.

It is an arithmetic number, because the mean of its divisors is an integer number (12546846).

Almost surely, 2^66893278 is an apocalyptic number.

66893278 is a deficient number, since it is larger than the sum of its proper divisors (33481490).

66893278 is a wasteful number, since it uses less digits than its factorization.

66893278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11618.

The product of its digits is 870912, while the sum is 49.

The square root of 66893278 is about 8178.8310900764. The cubic root of 66893278 is about 405.9390454245.

The spelling of 66893278 in words is "sixty-six million, eight hundred ninety-three thousand, two hundred seventy-eight".