66716380 has 12 divisors (see below), whose sum is σ = 140104440. Its totient is φ = 26686544.

The previous prime is 66716329. The next prime is 66716413. The reversal of 66716380 is 8361766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667890 + ... + 1667929.

It is an arithmetic number, because the mean of its divisors is an integer number (11675370).

Almost surely, 2^66716380 is an apocalyptic number.

It is an amenable number.

66716380 is an abundant number, since it is smaller than the sum of its proper divisors (73388060).

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

66716380 is a wasteful number, since it uses less digits than its factorization.

66716380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335828 (or 3335826 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 66716380 is about 8168.0095494557. The cubic root of 66716380 is about 405.5808968409.

The spelling of 66716380 in words is "sixty-six million, seven hundred sixteen thousand, three hundred eighty".