66908830 has 16 divisors (see below), whose sum is σ = 120939984. Its totient is φ = 26651520.

The previous prime is 66908801. The next prime is 66908833. The reversal of 66908830 is 3880966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66908833) 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, 11472 + ... + 16291.

It is an arithmetic number, because the mean of its divisors is an integer number (7558749).

Almost surely, 2^66908830 is an apocalyptic number.

66908830 is a deficient number, since it is larger than the sum of its proper divisors (54031154).

66908830 is a wasteful number, since it uses less digits than its factorization.

66908830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28011.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 66908830 is about 8179.7817819304. The cubic root of 66908830 is about 405.9705018730.

The spelling of 66908830 in words is "sixty-six million, nine hundred eight thousand, eight hundred thirty".