66808712 has 32 divisors (see below), whose sum is σ = 132300000. Its totient is φ = 31540608.

The previous prime is 66808661. The next prime is 66808727. The reversal of 66808712 is 21780866.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63164 + ... + 64212.

It is an arithmetic number, because the mean of its divisors is an integer number (4134375).

Almost surely, 2^66808712 is an apocalyptic number.

It is an amenable number.

66808712 is a deficient number, since it is larger than the sum of its proper divisors (65491288).

66808712 is a wasteful number, since it uses less digits than its factorization.

66808712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493 (or 1489 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 66808712 is about 8173.6596454709. The cubic root of 66808712 is about 405.7679115502.

The spelling of 66808712 in words is "sixty-six million, eight hundred eight thousand, seven hundred twelve".