66821348 has 24 divisors (see below), whose sum is σ = 133116480. Its totient is φ = 29052320.

The previous prime is 66821341. The next prime is 66821369. The reversal of 66821348 is 84312866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66821341) 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, 32003 + ... + 34026.

It is an arithmetic number, because the mean of its divisors is an integer number (5546520).

Almost surely, 2^66821348 is an apocalyptic number.

It is an amenable number.

66821348 is a deficient number, since it is larger than the sum of its proper divisors (66295132).

66821348 is a wasteful number, since it uses less digits than its factorization.

66821348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66067 (or 66065 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 66821348 is about 8174.4325796963. The cubic root of 66821348 is about 405.7934918473.

The spelling of 66821348 in words is "sixty-six million, eight hundred twenty-one thousand, three hundred forty-eight".