66828020 has 96 divisors (see below), whose sum is σ = 174037248. Its totient is φ = 21030912.

The previous prime is 66828007. The next prime is 66828023. The reversal of 66828020 is 2082866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66828023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102014 + ... + 102666.

It is an arithmetic number, because the mean of its divisors is an integer number (1812888).

Almost surely, 2^66828020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66828020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87018624).

66828020 is an abundant number, since it is smaller than the sum of its proper divisors (107209228).

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

66828020 is a wasteful number, since it uses less digits than its factorization.

66828020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 66828020 is about 8174.8406712302. The cubic root of 66828020 is about 405.8069973320.

The spelling of 66828020 in words is "sixty-six million, eight hundred twenty-eight thousand, twenty".