68339815 has 4 divisors (see below), whose sum is σ = 82007784. Its totient is φ = 54671848.

The previous prime is 68339797. The next prime is 68339837. The reversal of 68339815 is 51893386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51893386 = 2 ⋅25946693.

It is a cyclic number.

It is not a de Polignac number, because 68339815 - 2¹³ = 68331623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 6833977 + ... + 6833986.

It is an arithmetic number, because the mean of its divisors is an integer number (20501946).

Almost surely, 2^68339815 is an apocalyptic number.

68339815 is a deficient number, since it is larger than the sum of its proper divisors (13667969).

68339815 is a wasteful number, since it uses less digits than its factorization.

68339815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13667968.

The product of its digits is 155520, while the sum is 43.

The square root of 68339815 is about 8266.7898848344. The cubic root of 68339815 is about 408.8442864662.

The spelling of 68339815 in words is "sixty-eight million, three hundred thirty-nine thousand, eight hundred fifteen".