66028616 has 8 divisors (see below), whose sum is σ = 123803670. Its totient is φ = 33014304.

The previous prime is 66028601. The next prime is 66028631. The reversal of 66028616 is 61682066.

66028616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66028601) and next prime (66028631).

It can be written as a sum of positive squares in only one way, i.e., 43428100 + 22600516 = 6590^2 + 4754^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4126781 + ... + 4126796.

Almost surely, 2^66028616 is an apocalyptic number.

It is an amenable number.

66028616 is a deficient number, since it is larger than the sum of its proper divisors (57775054).

66028616 is a wasteful number, since it uses less digits than its factorization.

66028616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8253583 (or 8253579 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 66028616 is about 8125.7994068276. The cubic root of 66028616 is about 404.1823997465.

The spelling of 66028616 in words is "sixty-six million, twenty-eight thousand, six hundred sixteen".