68399218 has 4 divisors (see below), whose sum is σ = 102598830. Its totient is φ = 34199608.

The previous prime is 68399213. The next prime is 68399251. The reversal of 68399218 is 81299386.

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

It can be written as a sum of positive squares in only one way, i.e., 54508689 + 13890529 = 7383^2 + 3727^2 .

It is not an unprimeable number, because it can be changed into a prime (68399213) 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 as a sum of consecutive naturals, namely, 17099803 + ... + 17099806.

Almost surely, 2^68399218 is an apocalyptic number.

68399218 is a deficient number, since it is larger than the sum of its proper divisors (34199612).

68399218 is a wasteful number, since it uses less digits than its factorization.

68399218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34199611.

The product of its digits is 186624, while the sum is 46.

The square root of 68399218 is about 8270.3819742500. The cubic root of 68399218 is about 408.9627120315.

The spelling of 68399218 in words is "sixty-eight million, three hundred ninety-nine thousand, two hundred eighteen".