66707742 has 16 divisors (see below), whose sum is σ = 134597520. Its totient is φ = 22038912.

The previous prime is 66707741. The next prime is 66707777. The reversal of 66707742 is 24770766.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66707742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707741) 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, 48517 + ... + 49872.

It is an arithmetic number, because the mean of its divisors is an integer number (8412345).

Almost surely, 2^66707742 is an apocalyptic number.

66707742 is an abundant number, since it is smaller than the sum of its proper divisors (67889778).

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

66707742 is a wasteful number, since it uses less digits than its factorization.

66707742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98507.

The product of its (nonzero) digits is 98784, while the sum is 39.

The square root of 66707742 is about 8167.4807621445. The cubic root of 66707742 is about 405.5633920992.

The spelling of 66707742 in words is "sixty-six million, seven hundred seven thousand, seven hundred forty-two".