68213917 has 4 divisors (see below), whose sum is σ = 68263740. Its totient is φ = 68164096.

The previous prime is 68213909. The next prime is 68213947. The reversal of 68213917 is 71931286.

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 9400356 + 58813561 = 3066^2 + 7669^2 .

It is a cyclic number.

It is not a de Polignac number, because 68213917 - 2³ = 68213909 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 (68213947) 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, 22798 + ... + 25615.

It is an arithmetic number, because the mean of its divisors is an integer number (17065935).

Almost surely, 2^68213917 is an apocalyptic number.

It is an amenable number.

68213917 is a deficient number, since it is larger than the sum of its proper divisors (49823).

68213917 is a wasteful number, since it uses less digits than its factorization.

68213917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49822.

The product of its digits is 18144, while the sum is 37.

The square root of 68213917 is about 8259.1716897035. The cubic root of 68213917 is about 408.5930697164.

The spelling of 68213917 in words is "sixty-eight million, two hundred thirteen thousand, nine hundred seventeen".