66281344 has 16 divisors (see below), whose sum is σ = 132045120. Its totient is φ = 33140608.

The previous prime is 66281339. The next prime is 66281353. The reversal of 66281344 is 44318266.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258784 + ... + 259039.

It is an arithmetic number, because the mean of its divisors is an integer number (8252820).

Almost surely, 2^66281344 is an apocalyptic number.

66281344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66281344 is a deficient number, since it is larger than the sum of its proper divisors (65763776).

66281344 is an equidigital number, since it uses as much as digits as its factorization.

66281344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517837 (or 517825 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 66281344 is about 8141.3355169775. The cubic root of 66281344 is about 404.6974196790.

The spelling of 66281344 in words is "sixty-six million, two hundred eighty-one thousand, three hundred forty-four".