66733780 has 12 divisors (see below), whose sum is σ = 140140980. Its totient is φ = 26693504.

The previous prime is 66733747. The next prime is 66733781. The reversal of 66733780 is 8733766.

It can be written as a sum of positive squares in 2 ways, for example, as 20466576 + 46267204 = 4524^2 + 6802^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66733781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668325 + ... + 1668364.

It is an arithmetic number, because the mean of its divisors is an integer number (11678415).

Almost surely, 2^66733780 is an apocalyptic number.

It is an amenable number.

66733780 is an abundant number, since it is smaller than the sum of its proper divisors (73407200).

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

66733780 is a wasteful number, since it uses less digits than its factorization.

66733780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336698 (or 3336696 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 66733780 is about 8169.0746109948. The cubic root of 66733780 is about 405.6161530213.

The spelling of 66733780 in words is "sixty-six million, seven hundred thirty-three thousand, seven hundred eighty".