66727805 has 8 divisors (see below), whose sum is σ = 84783672. Its totient is φ = 50242048.

The previous prime is 66727789. The next prime is 66727813. The reversal of 66727805 is 50872766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26646244 + 40081561 = 5162^2 + 6331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66727805 - 2⁴ = 66727789 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 392432 + ... + 392601.

It is an arithmetic number, because the mean of its divisors is an integer number (10597959).

Almost surely, 2^66727805 is an apocalyptic number.

It is an amenable number.

66727805 is a deficient number, since it is larger than the sum of its proper divisors (18055867).

66727805 is a wasteful number, since it uses less digits than its factorization.

66727805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785055.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 66727805 is about 8168.7088943113. The cubic root of 66727805 is about 405.6040470641.

The spelling of 66727805 in words is "sixty-six million, seven hundred twenty-seven thousand, eight hundred five".