68440331 has 4 divisors (see below), whose sum is σ = 69731712. Its totient is φ = 67148952.

The previous prime is 68440321. The next prime is 68440367. The reversal of 68440331 is 13304486.

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 68440331 - 2²² = 64246027 is a prime.

It is a super-2 number, since 2×68440331² = 9368157814779122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68440294 and 68440303.

It is not an unprimeable number, because it can be changed into a prime (68440301) 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, 645611 + ... + 645716.

It is an arithmetic number, because the mean of its divisors is an integer number (17432928).

Almost surely, 2^68440331 is an apocalyptic number.

68440331 is a deficient number, since it is larger than the sum of its proper divisors (1291381).

68440331 is a wasteful number, since it uses less digits than its factorization.

68440331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291380.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 68440331 is about 8272.8671571590. The cubic root of 68440331 is about 409.0446345878.

The spelling of 68440331 in words is "sixty-eight million, four hundred forty thousand, three hundred thirty-one".