68222215 has 4 divisors (see below), whose sum is σ = 81866664. Its totient is φ = 54577768.

The previous prime is 68222213. The next prime is 68222221. The reversal of 68222215 is 51222286.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68222215 - 2¹ = 68222213 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 (68222213) 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, 6822217 + ... + 6822226.

It is an arithmetic number, because the mean of its divisors is an integer number (20466666).

Almost surely, 2^68222215 is an apocalyptic number.

68222215 is a deficient number, since it is larger than the sum of its proper divisors (13644449).

68222215 is a wasteful number, since it uses less digits than its factorization.

68222215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13644448.

The product of its digits is 3840, while the sum is 28.

The square root of 68222215 is about 8259.6740250448. The cubic root of 68222215 is about 408.6096370484.

The spelling of 68222215 in words is "sixty-eight million, two hundred twenty-two thousand, two hundred fifteen".