66347628 has 12 divisors (see below), whose sum is σ = 154811160. Its totient is φ = 22115872.

The previous prime is 66347599. The next prime is 66347647. The reversal of 66347628 is 82674366.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 66347628.

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, 2764473 + ... + 2764496.

It is an arithmetic number, because the mean of its divisors is an integer number (12900930).

Almost surely, 2^66347628 is an apocalyptic number.

It is an amenable number.

66347628 is an abundant number, since it is smaller than the sum of its proper divisors (88463532).

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

66347628 is a wasteful number, since it uses less digits than its factorization.

66347628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5528976 (or 5528974 counting only the distinct ones).

The product of its digits is 290304, while the sum is 42.

The square root of 66347628 is about 8145.4053306143. The cubic root of 66347628 is about 404.8322792795.

The spelling of 66347628 in words is "sixty-six million, three hundred forty-seven thousand, six hundred twenty-eight".