68198917 has 4 divisors (see below), whose sum is σ = 72210636. Its totient is φ = 64187200.

The previous prime is 68198899. The next prime is 68198929. The reversal of 68198917 is 71989186.

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 43903876 + 24295041 = 6626^2 + 4929^2 .

It is a cyclic number.

It is not a de Polignac number, because 68198917 - 2⁷ = 68198789 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 (68198987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2005834 + ... + 2005867.

It is an arithmetic number, because the mean of its divisors is an integer number (18052659).

Almost surely, 2^68198917 is an apocalyptic number.

It is an amenable number.

68198917 is a deficient number, since it is larger than the sum of its proper divisors (4011719).

68198917 is a wasteful number, since it uses less digits than its factorization.

68198917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4011718.

The product of its digits is 217728, while the sum is 49.

The square root of 68198917 is about 8258.2635584002. The cubic root of 68198917 is about 408.5631181288.

The spelling of 68198917 in words is "sixty-eight million, one hundred ninety-eight thousand, nine hundred seventeen".