66923660 has 24 divisors (see below), whose sum is σ = 140932176. Its totient is φ = 26694720.

The previous prime is 66923657. The next prime is 66923663. The reversal of 66923660 is 6632966.

It is an interprime number because it is at equal distance from previous prime (66923657) and next prime (66923663).

It is not an unprimeable number, because it can be changed into a prime (66923663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2975 + ... + 11945.

It is an arithmetic number, because the mean of its divisors is an integer number (5872174).

Almost surely, 2^66923660 is an apocalyptic number.

It is an amenable number.

66923660 is an abundant number, since it is smaller than the sum of its proper divisors (74008516).

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

66923660 is a wasteful number, since it uses less digits than its factorization.

66923660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9353 (or 9351 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 66923660 is about 8180.6882351059. The cubic root of 66923660 is about 406.0004934191. Note that the first 3 decimals are identical.

The spelling of 66923660 in words is "sixty-six million, nine hundred twenty-three thousand, six hundred sixty".