66840286 has 8 divisors (see below), whose sum is σ = 100361880. Its totient is φ = 33386328.

The previous prime is 66840281. The next prime is 66840287. The reversal of 66840286 is 68204866.

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 (66840281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14361 + ... + 18436.

It is an arithmetic number, because the mean of its divisors is an integer number (12545235).

Almost surely, 2^66840286 is an apocalyptic number.

66840286 is a deficient number, since it is larger than the sum of its proper divisors (33521594).

66840286 is a wasteful number, since it uses less digits than its factorization.

66840286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33818.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 66840286 is about 8175.5908654971. The cubic root of 66840286 is about 405.8318238649.

The spelling of 66840286 in words is "sixty-six million, eight hundred forty thousand, two hundred eighty-six".