66628288 has 56 divisors (see below), whose sum is σ = 140462000. Its totient is φ = 31269888.

The previous prime is 66628279. The next prime is 66628301. The reversal of 66628288 is 88282666.

66628288 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 in 7 ways as a sum of consecutive naturals, for example, 190738 + ... + 191086.

It is an arithmetic number, because the mean of its divisors is an integer number (2508250).

Almost surely, 2^66628288 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 66628288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70231000).

66628288 is an abundant number, since it is smaller than the sum of its proper divisors (73833712).

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

66628288 is a wasteful number, since it uses less digits than its factorization.

66628288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 527 counting only the distinct ones).

The product of its digits is 442368, while the sum is 46.

The square root of 66628288 is about 8162.6152671800. The cubic root of 66628288 is about 405.4023091681.

The spelling of 66628288 in words is "sixty-six million, six hundred twenty-eight thousand, two hundred eighty-eight".