66220838 has 8 divisors (see below), whose sum is σ = 101444832. Its totient is φ = 32405896.

The previous prime is 66220801. The next prime is 66220849. The reversal of 66220838 is 83802266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 66220798 and 66220807.

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, 352145 + ... + 352332.

It is an arithmetic number, because the mean of its divisors is an integer number (12680604).

Almost surely, 2^66220838 is an apocalyptic number.

66220838 is a deficient number, since it is larger than the sum of its proper divisors (35223994).

66220838 is a wasteful number, since it uses less digits than its factorization.

66220838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704526.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 66220838 is about 8137.6186934508. The cubic root of 66220838 is about 404.5742373204.

The spelling of 66220838 in words is "sixty-six million, two hundred twenty thousand, eight hundred thirty-eight".