66890686 has 8 divisors (see below), whose sum is σ = 100379520. Its totient is φ = 33430848.

The previous prime is 66890657. The next prime is 66890701. The reversal of 66890686 is 68609866.

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 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, 51 + ... + 11566.

It is an arithmetic number, because the mean of its divisors is an integer number (12547440).

Almost surely, 2^66890686 is an apocalyptic number.

66890686 is a deficient number, since it is larger than the sum of its proper divisors (33488834).

66890686 is a wasteful number, since it uses less digits than its factorization.

66890686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14498.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 66890686 is about 8178.6726306901. The cubic root of 66890686 is about 405.9338022091.

It can be divided in two parts, 66890 and 686, that added together give a palindrome (67576).

The spelling of 66890686 in words is "sixty-six million, eight hundred ninety thousand, six hundred eighty-six".