66727391 has 8 divisors (see below), whose sum is σ = 68689104. Its totient is φ = 64774080.

The previous prime is 66727387. The next prime is 66727399. The reversal of 66727391 is 19372766.

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 66727391 - 2² = 66727387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66727399) by changing a digit.

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, 16331 + ... + 20003.

It is an arithmetic number, because the mean of its divisors is an integer number (8586138).

Almost surely, 2^66727391 is an apocalyptic number.

66727391 is a deficient number, since it is larger than the sum of its proper divisors (1961713).

66727391 is a wasteful number, since it uses less digits than its factorization.

66727391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201.

The product of its digits is 95256, while the sum is 41.

The square root of 66727391 is about 8168.6835536701. The cubic root of 66727391 is about 405.6032082313.

The spelling of 66727391 in words is "sixty-six million, seven hundred twenty-seven thousand, three hundred ninety-one".