68622217 has 4 divisors (see below), whose sum is σ = 72658836. Its totient is φ = 64585600.

The previous prime is 68622193. The next prime is 68622221. The reversal of 68622217 is 71222686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41332041 + 27290176 = 6429^2 + 5224^2 .

It is a cyclic number.

It is not a de Polignac number, because 68622217 - 2⁷ = 68622089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68622287) 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, 2018284 + ... + 2018317.

It is an arithmetic number, because the mean of its divisors is an integer number (18164709).

Almost surely, 2^68622217 is an apocalyptic number.

It is an amenable number.

68622217 is a deficient number, since it is larger than the sum of its proper divisors (4036619).

68622217 is a wasteful number, since it uses less digits than its factorization.

68622217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036618.

The product of its digits is 16128, while the sum is 34.

The square root of 68622217 is about 8283.8527871999. The cubic root of 68622217 is about 409.4066710303.

The spelling of 68622217 in words is "sixty-eight million, six hundred twenty-two thousand, two hundred seventeen".