67667221 has 4 divisors (see below), whose sum is σ = 67692352. Its totient is φ = 67642092.

The previous prime is 67667209. The next prime is 67667279. The reversal of 67667221 is 12276676.

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 67667221 - 2¹³ = 67659029 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 (67667321) 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, 7965 + ... + 14098.

It is an arithmetic number, because the mean of its divisors is an integer number (16923088).

Almost surely, 2^67667221 is an apocalyptic number.

It is an amenable number.

67667221 is a deficient number, since it is larger than the sum of its proper divisors (25131).

67667221 is a wasteful number, since it uses less digits than its factorization.

67667221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25130.

The product of its digits is 42336, while the sum is 37.

The square root of 67667221 is about 8226.0088135134. The cubic root of 67667221 is about 407.4985930924.

The spelling of 67667221 in words is "sixty-seven million, six hundred sixty-seven thousand, two hundred twenty-one".