68722217 has 4 divisors (see below), whose sum is σ = 69106320. Its totient is φ = 68338116.

The previous prime is 68722189. The next prime is 68722219. The reversal of 68722217 is 71222786.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71222786 = 2 ⋅35611393.

It is a cyclic number.

It is not a de Polignac number, because 68722217 - 2¹⁰ = 68721193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68722219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191783 + ... + 192140.

It is an arithmetic number, because the mean of its divisors is an integer number (17276580).

Almost surely, 2^68722217 is an apocalyptic number.

It is an amenable number.

68722217 is a deficient number, since it is larger than the sum of its proper divisors (384103).

68722217 is a wasteful number, since it uses less digits than its factorization.

68722217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384102.

The product of its digits is 18816, while the sum is 35.

The square root of 68722217 is about 8289.8864286551. The cubic root of 68722217 is about 409.6054443430.

The spelling of 68722217 in words is "sixty-eight million, seven hundred twenty-two thousand, two hundred seventeen".