68331845 has 4 divisors (see below), whose sum is σ = 81998220. Its totient is φ = 54665472.

The previous prime is 68331839. The next prime is 68331863. The reversal of 68331845 is 54813386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54813386 = 2 ⋅27406693.

It can be written as a sum of positive squares in 2 ways, for example, as 50708641 + 17623204 = 7121^2 + 4198^2 .

It is a cyclic number.

It is not a de Polignac number, because 68331845 - 2⁸ = 68331589 is a prime.

It is a super-2 number, since 2×68331845² = 9338482082208050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 68331799 and 68331808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6833180 + ... + 6833189.

It is an arithmetic number, because the mean of its divisors is an integer number (20499555).

Almost surely, 2^68331845 is an apocalyptic number.

It is an amenable number.

68331845 is a deficient number, since it is larger than the sum of its proper divisors (13666375).

68331845 is a wasteful number, since it uses less digits than its factorization.

68331845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13666374.

The product of its digits is 69120, while the sum is 38.

The square root of 68331845 is about 8266.3078215126. The cubic root of 68331845 is about 408.8283922878.

The spelling of 68331845 in words is "sixty-eight million, three hundred thirty-one thousand, eight hundred forty-five".