66743688 has 32 divisors (see below), whose sum is σ = 182028960. Its totient is φ = 20225280.

The previous prime is 66743687. The next prime is 66743693. The reversal of 66743688 is 88634766.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66743687) 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, 126145 + ... + 126672.

It is an arithmetic number, because the mean of its divisors is an integer number (5688405).

Almost surely, 2^66743688 is an apocalyptic number.

It is an amenable number.

66743688 is an abundant number, since it is smaller than the sum of its proper divisors (115285272).

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

66743688 is a wasteful number, since it uses less digits than its factorization.

66743688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252837 (or 252833 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 48.

The square root of 66743688 is about 8169.6810219249. The cubic root of 66743688 is about 405.6362260436.

The spelling of 66743688 in words is "sixty-six million, seven hundred forty-three thousand, six hundred eighty-eight".