66447708 has 48 divisors (see below), whose sum is σ = 160812960. Its totient is φ = 21337344.

The previous prime is 66447691. The next prime is 66447737. The reversal of 66447708 is 80774466.

It is a self number, because there is not a number n which added to its sum of digits gives 66447708.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 47710 + ... + 49082.

It is an arithmetic number, because the mean of its divisors is an integer number (3350270).

Almost surely, 2^66447708 is an apocalyptic number.

It is an amenable number.

66447708 is an abundant number, since it is smaller than the sum of its proper divisors (94365252).

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

66447708 is a wasteful number, since it uses less digits than its factorization.

66447708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 66447708 is about 8151.5463563670. The cubic root of 66447708 is about 405.0357292057.

The spelling of 66447708 in words is "sixty-six million, four hundred forty-seven thousand, seven hundred eight".