66907684 has 6 divisors (see below), whose sum is σ = 117088454. Its totient is φ = 33453840.

The previous prime is 66907657. The next prime is 66907691. The reversal of 66907684 is 48670966.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 8538084 = 7640^2 + 2922^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8363457 + ... + 8363464.

Almost surely, 2^66907684 is an apocalyptic number.

It is an amenable number.

66907684 is a deficient number, since it is larger than the sum of its proper divisors (50180770).

66907684 is a wasteful number, since it uses less digits than its factorization.

66907684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16726925 (or 16726923 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 66907684 is about 8179.7117308619. The cubic root of 66907684 is about 405.9681840680.

The spelling of 66907684 in words is "sixty-six million, nine hundred seven thousand, six hundred eighty-four".