66713744 has 10 divisors (see below), whose sum is σ = 129257910. Its totient is φ = 33356864.

The previous prime is 66713741. The next prime is 66713819. The reversal of 66713744 is 44731766.

It can be written as a sum of positive squares in only one way, i.e., 56550400 + 10163344 = 7520^2 + 3188^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66713698 and 66713707.

It is not an unprimeable number, because it can be changed into a prime (66713741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2084789 + ... + 2084820.

It is an arithmetic number, because the mean of its divisors is an integer number (12925791).

Almost surely, 2^66713744 is an apocalyptic number.

It is an amenable number.

66713744 is a deficient number, since it is larger than the sum of its proper divisors (62544166).

66713744 is a wasteful number, since it uses less digits than its factorization.

66713744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4169617 (or 4169611 counting only the distinct ones).

The product of its digits is 84672, while the sum is 38.

The square root of 66713744 is about 8167.8481866401. The cubic root of 66713744 is about 405.5755551976.

The spelling of 66713744 in words is "sixty-six million, seven hundred thirteen thousand, seven hundred forty-four".