66706986 has 16 divisors (see below), whose sum is σ = 140436000. Its totient is φ = 21065328.

The previous prime is 66706979. The next prime is 66706987. The reversal of 66706986 is 68960766.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66706987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292461 + ... + 292688.

It is an arithmetic number, because the mean of its divisors is an integer number (8777250).

Almost surely, 2^66706986 is an apocalyptic number.

66706986 is an abundant number, since it is smaller than the sum of its proper divisors (73729014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66706986 is a wasteful number, since it uses less digits than its factorization.

66706986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585173.

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 66706986 is about 8167.4344809126. The cubic root of 66706986 is about 405.5618600078.

The spelling of 66706986 in words is "sixty-six million, seven hundred six thousand, nine hundred eighty-six".