66740687 has 32 divisors (see below), whose sum is σ = 79833600. Its totient is φ = 55262592.

The previous prime is 66740683. The next prime is 66740689. The reversal of 66740687 is 78604766.

It is a cyclic number.

It is not a de Polignac number, because 66740687 - 2² = 66740683 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66740683) 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 31 ways as a sum of consecutive naturals, for example, 372764 + ... + 372942.

It is an arithmetic number, because the mean of its divisors is an integer number (2494800).

Almost surely, 2^66740687 is an apocalyptic number.

66740687 is a deficient number, since it is larger than the sum of its proper divisors (13092913).

66740687 is a wasteful number, since it uses less digits than its factorization.

66740687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 66740687 is about 8169.4973529587. The cubic root of 66740687 is about 405.6301464048.

The spelling of 66740687 in words is "sixty-six million, seven hundred forty thousand, six hundred eighty-seven".