68138899 has 4 divisors (see below), whose sum is σ = 70336960. Its totient is φ = 65940840.

The previous prime is 68138897. The next prime is 68138909. The reversal of 68138899 is 99883186.

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 68138899 - 2¹ = 68138897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68138897) 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, 1098984 + ... + 1099045.

It is an arithmetic number, because the mean of its divisors is an integer number (17584240).

Almost surely, 2^68138899 is an apocalyptic number.

68138899 is a deficient number, since it is larger than the sum of its proper divisors (2198061).

68138899 is a wasteful number, since it uses less digits than its factorization.

68138899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198060.

The product of its digits is 746496, while the sum is 52.

The square root of 68138899 is about 8254.6289438109. The cubic root of 68138899 is about 408.4432318752.

The spelling of 68138899 in words is "sixty-eight million, one hundred thirty-eight thousand, eight hundred ninety-nine".