68178221 has 4 divisors (see below), whose sum is σ = 68203200. Its totient is φ = 68153244.

The previous prime is 68178199. The next prime is 68178223. The reversal of 68178221 is 12287186.

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 68178221 - 2¹⁸ = 67916077 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 (68178223) 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, 7811 + ... + 14048.

It is an arithmetic number, because the mean of its divisors is an integer number (17050800).

Almost surely, 2^68178221 is an apocalyptic number.

It is an amenable number.

68178221 is a deficient number, since it is larger than the sum of its proper divisors (24979).

68178221 is a wasteful number, since it uses less digits than its factorization.

68178221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24978.

The product of its digits is 10752, while the sum is 35.

The square root of 68178221 is about 8257.0104153985. The cubic root of 68178221 is about 408.5217857140.

The spelling of 68178221 in words is "sixty-eight million, one hundred seventy-eight thousand, two hundred twenty-one".