66347768 has 8 divisors (see below), whose sum is σ = 124402080. Its totient is φ = 33173880.

The previous prime is 66347761. The next prime is 66347773. The reversal of 66347768 is 86774366.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66347761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4146728 + ... + 4146743.

It is an arithmetic number, because the mean of its divisors is an integer number (15550260).

Almost surely, 2^66347768 is an apocalyptic number.

It is an amenable number.

66347768 is a deficient number, since it is larger than the sum of its proper divisors (58054312).

66347768 is a wasteful number, since it uses less digits than its factorization.

66347768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8293477 (or 8293473 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 47.

The square root of 66347768 is about 8145.4139244117. The cubic root of 66347768 is about 404.8325640246.

The spelling of 66347768 in words is "sixty-six million, three hundred forty-seven thousand, seven hundred sixty-eight".