66216828 has 48 divisors (see below), whose sum is σ = 159536160. Its totient is φ = 21360384.

The previous prime is 66216827. The next prime is 66216833. The reversal of 66216828 is 82861266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66216823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129838 + ... + 130346.

It is an arithmetic number, because the mean of its divisors is an integer number (3323670).

Almost surely, 2^66216828 is an apocalyptic number.

It is an amenable number.

66216828 is an abundant number, since it is smaller than the sum of its proper divisors (93319332).

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

66216828 is a wasteful number, since it uses less digits than its factorization.

66216828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 844 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 66216828 is about 8137.3723031455. The cubic root of 66216828 is about 404.5660708304.

The spelling of 66216828 in words is "sixty-six million, two hundred sixteen thousand, eight hundred twenty-eight".