68443309 has 32 divisors (see below), whose sum is σ = 82736640. Its totient is φ = 55910400.

The previous prime is 68443283. The next prime is 68443313. The reversal of 68443309 is 90334486.

It is a cyclic number.

It is not a de Polignac number, because 68443309 - 2¹³ = 68435117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68443379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 605637 + ... + 605749.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^68443309 is an apocalyptic number.

It is an amenable number.

68443309 is a deficient number, since it is larger than the sum of its proper divisors (14293331).

68443309 is a wasteful number, since it uses less digits than its factorization.

68443309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 68443309 is about 8273.0471411687. The cubic root of 68443309 is about 409.0505673335.

It can be divided in two parts, 6844 and 3309, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 68443309 in words is "sixty-eight million, four hundred forty-three thousand, three hundred nine".