67783221 has 24 divisors (see below), whose sum is σ = 107883360. Its totient is φ = 40668000.

The previous prime is 67783217. The next prime is 67783273. The reversal of 67783221 is 12238776.

It is not a de Polignac number, because 67783221 - 2² = 67783217 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67788221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6610 + ... + 13388.

It is an arithmetic number, because the mean of its divisors is an integer number (4495140).

Almost surely, 2^67783221 is an apocalyptic number.

It is an amenable number.

67783221 is a deficient number, since it is larger than the sum of its proper divisors (40100139).

67783221 is a wasteful number, since it uses less digits than its factorization.

67783221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6897 (or 6894 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 67783221 is about 8233.0566012873. The cubic root of 67783221 is about 407.7313145917.

It can be divided in two parts, 6778 and 3221, that added together give a palindrome (9999).

The spelling of 67783221 in words is "sixty-seven million, seven hundred eighty-three thousand, two hundred twenty-one".