66747700 has 18 divisors (see below), whose sum is σ = 144842726. Its totient is φ = 26699040.

The previous prime is 66747697. The next prime is 66747727. The reversal of 66747700 is 774766.

It can be written as a sum of positive squares in 3 ways, for example, as 15539364 + 51208336 = 3942^2 + 7156^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66747700.

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 5 ways as a sum of consecutive naturals, for example, 333639 + ... + 333838.

Almost surely, 2^66747700 is an apocalyptic number.

It is an amenable number.

66747700 is an abundant number, since it is smaller than the sum of its proper divisors (78095026).

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

66747700 is a wasteful number, since it uses less digits than its factorization.

66747700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667491 (or 667484 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 66747700 is about 8169.9265602574. The cubic root of 66747700 is about 405.6443535534.

The spelling of 66747700 in words is "sixty-six million, seven hundred forty-seven thousand, seven hundred".