66021248 has 32 divisors (see below), whose sum is σ = 133212000. Its totient is φ = 32587776.

The previous prime is 66021239. The next prime is 66021253. The reversal of 66021248 is 84212066.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 66021248.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6848 + ... + 13376.

It is an arithmetic number, because the mean of its divisors is an integer number (4162875).

Almost surely, 2^66021248 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 66021248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66606000).

66021248 is an abundant number, since it is smaller than the sum of its proper divisors (67190752).

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

66021248 is an equidigital number, since it uses as much as digits as its factorization.

66021248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6622 (or 6610 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 66021248 is about 8125.3460234011. The cubic root of 66021248 is about 404.1673652212.

The spelling of 66021248 in words is "sixty-six million, twenty-one thousand, two hundred forty-eight".