66727705 has 32 divisors (see below), whose sum is σ = 90574848. Its totient is φ = 46771200.

The previous prime is 66727693. The next prime is 66727709. The reversal of 66727705 is 50772766.

It is a de Polignac number, because none of the positive numbers 2^k-66727705 is a prime.

It is a super-2 number, since 2×66727705² = 8905173229134050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66727709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 286269 + ... + 286501.

It is an arithmetic number, because the mean of its divisors is an integer number (2830464).

Almost surely, 2^66727705 is an apocalyptic number.

It is an amenable number.

66727705 is a deficient number, since it is larger than the sum of its proper divisors (23847143).

66727705 is a wasteful number, since it uses less digits than its factorization.

66727705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417.

The product of its (nonzero) digits is 123480, while the sum is 40.

The square root of 66727705 is about 8168.7027733906. The cubic root of 66727705 is about 405.6038444478.

The spelling of 66727705 in words is "sixty-six million, seven hundred twenty-seven thousand, seven hundred five".