66021284 has 24 divisors (see below), whose sum is σ = 136597440. Its totient is φ = 27318816.

The previous prime is 66021281. The next prime is 66021287. The reversal of 66021284 is 48212066.

It is an interprime number because it is at equal distance from previous prime (66021281) and next prime (66021287).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (66021281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39842 + ... + 41465.

It is an arithmetic number, because the mean of its divisors is an integer number (5691560).

Almost surely, 2^66021284 is an apocalyptic number.

It is an amenable number.

66021284 is an abundant number, since it is smaller than the sum of its proper divisors (70576156).

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

66021284 is a wasteful number, since it uses less digits than its factorization.

66021284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81347 (or 81345 counting only the distinct ones).

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

The square root of 66021284 is about 8125.3482386911. The cubic root of 66021284 is about 404.1674386825.

The spelling of 66021284 in words is "sixty-six million, twenty-one thousand, two hundred eighty-four".