68388385 has 12 divisors (see below), whose sum is σ = 88865532. Its totient is φ = 50501568.

The previous prime is 68388377. The next prime is 68388389. The reversal of 68388385 is 58388386.

It can be written as a sum of positive squares in 6 ways, for example, as 16418704 + 51969681 = 4052^2 + 7209^2 .

It is not a de Polignac number, because 68388385 - 2³ = 68388377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68388389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39622 + ... + 41311.

It is an arithmetic number, because the mean of its divisors is an integer number (7405461).

Almost surely, 2^68388385 is an apocalyptic number.

68388385 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68388385 is a deficient number, since it is larger than the sum of its proper divisors (20477147).

68388385 is a wasteful number, since it uses less digits than its factorization.

68388385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80964 (or 80951 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The square root of 68388385 is about 8269.7270208877. The cubic root of 68388385 is about 408.9411205227.

Subtracting from 68388385 its reverse (58388386), we obtain a palindrome (9999999).

The spelling of 68388385 in words is "sixty-eight million, three hundred eighty-eight thousand, three hundred eighty-five".