66707380 has 12 divisors (see below), whose sum is σ = 140085540. Its totient is φ = 26682944.

The previous prime is 66707359. The next prime is 66707413. The reversal of 66707380 is 8370766.

It can be written as a sum of positive squares in 2 ways, for example, as 46403344 + 20304036 = 6812^2 + 4506^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667665 + ... + 1667704.

It is an arithmetic number, because the mean of its divisors is an integer number (11673795).

Almost surely, 2^66707380 is an apocalyptic number.

It is an amenable number.

66707380 is an abundant number, since it is smaller than the sum of its proper divisors (73378160).

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

66707380 is a wasteful number, since it uses less digits than its factorization.

66707380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335378 (or 3335376 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 66707380 is about 8167.4586010582. The cubic root of 66707380 is about 405.5626584802.

The spelling of 66707380 in words is "sixty-six million, seven hundred seven thousand, three hundred eighty".