68219618 has 4 divisors (see below), whose sum is σ = 102329430. Its totient is φ = 34109808.

The previous prime is 68219611. The next prime is 68219647. The reversal of 68219618 is 81691286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81691286 = 2 ⋅40845643.

It can be written as a sum of positive squares in only one way, i.e., 60171049 + 8048569 = 7757^2 + 2837^2 .

It is not an unprimeable number, because it can be changed into a prime (68219611) 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, 17054903 + ... + 17054906.

Almost surely, 2^68219618 is an apocalyptic number.

68219618 is a deficient number, since it is larger than the sum of its proper divisors (34109812).

68219618 is a wasteful number, since it uses less digits than its factorization.

68219618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34109811.

The product of its digits is 41472, while the sum is 41.

The square root of 68219618 is about 8259.5168139547. The cubic root of 68219618 is about 408.6044521649.

The spelling of 68219618 in words is "sixty-eight million, two hundred nineteen thousand, six hundred eighteen".