66712804 has 6 divisors (see below), whose sum is σ = 116747414. Its totient is φ = 33356400.

The previous prime is 66712801. The next prime is 66712829. The reversal of 66712804 is 40821766.

It can be written as a sum of positive squares in only one way, i.e., 38068900 + 28643904 = 6170^2 + 5352^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66712804.

It is not an unprimeable number, because it can be changed into a prime (66712801) 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 as a sum of consecutive naturals, namely, 8339097 + ... + 8339104.

Almost surely, 2^66712804 is an apocalyptic number.

It is an amenable number.

66712804 is a deficient number, since it is larger than the sum of its proper divisors (50034610).

66712804 is a wasteful number, since it uses less digits than its factorization.

66712804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16678205 (or 16678203 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66712804 is about 8167.7906437420. The cubic root of 66712804 is about 405.5736503286.

The spelling of 66712804 in words is "sixty-six million, seven hundred twelve thousand, eight hundred four".