66704729 has 12 divisors (see below), whose sum is σ = 83564964. Its totient is φ = 52776864.

The previous prime is 66704689. The next prime is 66704749. The reversal of 66704729 is 92740766.

It can be written as a sum of positive squares in 2 ways, for example, as 7414729 + 59290000 = 2723^2 + 7700^2 .

It is not a de Polignac number, because 66704729 - 2¹⁶ = 66639193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66704749) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 51722 + ... + 52995.

It is an arithmetic number, because the mean of its divisors is an integer number (6963747).

Almost surely, 2^66704729 is an apocalyptic number.

It is an amenable number.

66704729 is a deficient number, since it is larger than the sum of its proper divisors (16860235).

66704729 is a wasteful number, since it uses less digits than its factorization.

66704729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104744 (or 104737 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 66704729 is about 8167.2963090609. The cubic root of 66704729 is about 405.5572859569.

The spelling of 66704729 in words is "sixty-six million, seven hundred four thousand, seven hundred twenty-nine".