66284890 has 32 divisors (see below), whose sum is σ = 138288384. Its totient is φ = 22404480.

The previous prime is 66284861. The next prime is 66284893. The reversal of 66284890 is 9848266.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66284893) 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 15 ways as a sum of consecutive naturals, for example, 1699 + ... + 11638.

It is an arithmetic number, because the mean of its divisors is an integer number (4321512).

Almost surely, 2^66284890 is an apocalyptic number.

66284890 is an abundant number, since it is smaller than the sum of its proper divisors (72003494).

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

66284890 is a wasteful number, since it uses less digits than its factorization.

66284890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13422.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 66284890 is about 8141.5532916023. The cubic root of 66284890 is about 404.7046365487.

The spelling of 66284890 in words is "sixty-six million, two hundred eighty-four thousand, eight hundred ninety".