67632221 has 4 divisors (see below), whose sum is σ = 67687200. Its totient is φ = 67577244.

The previous prime is 67632217. The next prime is 67632223. The reversal of 67632221 is 12223676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67632221 - 2² = 67632217 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 (67632223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25601 + ... + 28118.

It is an arithmetic number, because the mean of its divisors is an integer number (16921800).

Almost surely, 2^67632221 is an apocalyptic number.

It is an amenable number.

67632221 is a deficient number, since it is larger than the sum of its proper divisors (54979).

67632221 is a wasteful number, since it uses less digits than its factorization.

67632221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54978.

The product of its digits is 6048, while the sum is 29.

The square root of 67632221 is about 8223.8811397053. The cubic root of 67632221 is about 407.4283231730.

Adding to 67632221 its reverse (12223676), we get a palindrome (79855897).

The spelling of 67632221 in words is "sixty-seven million, six hundred thirty-two thousand, two hundred twenty-one".