66988 has 6 divisors (see below), whose sum is σ = 117236. Its totient is φ = 33492.

The previous prime is 66977. The next prime is 67003. The reversal of 66988 is 88966.

It is an Ulam number.

It is an unprimeable number.

66988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8370 + ... + 8377.

2⁶⁶⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

66988 is a deficient number, since it is larger than the sum of its proper divisors (50248).

66988 is a wasteful number, since it uses less digits than its factorization.

66988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16751 (or 16749 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 66988 is about 258.8204010506. The cubic root of 66988 is about 40.6130560548.

It can be divided in two parts, 669 and 88, that added together give a palindrome (757).

The spelling of 66988 in words is "sixty-six thousand, nine hundred eighty-eight".