68399879 has 4 divisors (see below), whose sum is σ = 68603184. Its totient is φ = 68196576.

The previous prime is 68399873. The next prime is 68399921. The reversal of 68399879 is 97899386.

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 68399879 - 2¹² = 68395783 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 (68399873) 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, 101147 + ... + 101820.

It is an arithmetic number, because the mean of its divisors is an integer number (17150796).

Almost surely, 2^68399879 is an apocalyptic number.

68399879 is a deficient number, since it is larger than the sum of its proper divisors (203305).

68399879 is a wasteful number, since it uses less digits than its factorization.

68399879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203304.

The product of its digits is 5878656, while the sum is 59.

The square root of 68399879 is about 8270.4219360320. The cubic root of 68399879 is about 408.9640294125.

The spelling of 68399879 in words is "sixty-eight million, three hundred ninety-nine thousand, eight hundred seventy-nine".