68440307 has 16 divisors (see below), whose sum is σ = 75479040. Its totient is φ = 61674912.

The previous prime is 68440301. The next prime is 68440321. The reversal of 68440307 is 70304486.

It is a happy number.

It is not a de Polignac number, because 68440307 - 2⁶ = 68440243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68440301) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 105458 + ... + 106104.

It is an arithmetic number, because the mean of its divisors is an integer number (4717440).

Almost surely, 2^68440307 is an apocalyptic number.

68440307 is a deficient number, since it is larger than the sum of its proper divisors (7038733).

68440307 is a wasteful number, since it uses less digits than its factorization.

68440307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 68440307 is about 8272.8657066339. The cubic root of 68440307 is about 409.0445867745.

The spelling of 68440307 in words is "sixty-eight million, four hundred forty thousand, three hundred seven".