67620221 has 16 divisors (see below), whose sum is σ = 72758400. Its totient is φ = 62659008.

The previous prime is 67620211. The next prime is 67620227. The reversal of 67620221 is 12202676.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67620221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67620227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213155 + ... + 213471.

It is an arithmetic number, because the mean of its divisors is an integer number (4547400).

Almost surely, 2^67620221 is an apocalyptic number.

It is an amenable number.

67620221 is a deficient number, since it is larger than the sum of its proper divisors (5138179).

67620221 is a wasteful number, since it uses less digits than its factorization.

67620221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 67620221 is about 8223.1515248109. The cubic root of 67620221 is about 407.4042250484.

Adding to 67620221 its reverse (12202676), we get a palindrome (79822897).

The spelling of 67620221 in words is "sixty-seven million, six hundred twenty thousand, two hundred twenty-one".