66506028 has 12 divisors (see below), whose sum is σ = 155180760. Its totient is φ = 22168672.

The previous prime is 66506021. The next prime is 66506029. The reversal of 66506028 is 82060566.

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 66506028.

It is not an unprimeable number, because it can be changed into a prime (66506021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2771073 + ... + 2771096.

It is an arithmetic number, because the mean of its divisors is an integer number (12931730).

Almost surely, 2^66506028 is an apocalyptic number.

It is an amenable number.

66506028 is an abundant number, since it is smaller than the sum of its proper divisors (88674732).

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

66506028 is a wasteful number, since it uses less digits than its factorization.

66506028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5542176 (or 5542174 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 66506028 is about 8155.1228071685. The cubic root of 66506028 is about 405.1541921647.

The spelling of 66506028 in words is "sixty-six million, five hundred six thousand, twenty-eight".