68718719 has 4 divisors (see below), whose sum is σ = 71088360. Its totient is φ = 66349080.

The previous prime is 68718707. The next prime is 68718721. The reversal of 68718719 is 91781786.

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

It is a cyclic number.

It is not a de Polignac number, because 68718719 - 2¹² = 68714623 is a prime.

It is a super-2 number, since 2×68718719² = 9444524682001922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68718739) 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, 1184777 + ... + 1184834.

It is an arithmetic number, because the mean of its divisors is an integer number (17772090).

Almost surely, 2^68718719 is an apocalyptic number.

68718719 is a deficient number, since it is larger than the sum of its proper divisors (2369641).

68718719 is a wasteful number, since it uses less digits than its factorization.

68718719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369640.

The product of its digits is 169344, while the sum is 47.

The square root of 68718719 is about 8289.6754459991. The cubic root of 68718719 is about 409.5984945083.

The spelling of 68718719 in words is "sixty-eight million, seven hundred eighteen thousand, seven hundred nineteen".