66808746 has 16 divisors (see below), whose sum is σ = 148464000. Its totient is φ = 22269564.

The previous prime is 66808741. The next prime is 66808747. The reversal of 66808746 is 64780866.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66808741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618546 + ... + 618653.

It is an arithmetic number, because the mean of its divisors is an integer number (9279000).

Almost surely, 2^66808746 is an apocalyptic number.

66808746 is an abundant number, since it is smaller than the sum of its proper divisors (81655254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66808746 is a wasteful number, since it uses less digits than its factorization.

66808746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237210 (or 1237204 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 66808746 is about 8173.6617253224. The cubic root of 66808746 is about 405.7679803841.

The spelling of 66808746 in words is "sixty-six million, eight hundred eight thousand, seven hundred forty-six".