68505389 has 8 divisors (see below), whose sum is σ = 70467960. Its totient is φ = 66548736.

The previous prime is 68505361. The next prime is 68505391. The reversal of 68505389 is 98350586.

It can be written as a sum of positive squares in 4 ways, for example, as 11276164 + 57229225 = 3358^2 + 7565^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68505389 - 2¹⁶ = 68439853 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 (68505329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33377 + ... + 35369.

It is an arithmetic number, because the mean of its divisors is an integer number (8808495).

Almost surely, 2^68505389 is an apocalyptic number.

It is an amenable number.

68505389 is a deficient number, since it is larger than the sum of its proper divisors (1962571).

68505389 is a wasteful number, since it uses less digits than its factorization.

68505389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 68505389 is about 8276.7982336167. The cubic root of 68505389 is about 409.1742034046.

The spelling of 68505389 in words is "sixty-eight million, five hundred five thousand, three hundred eighty-nine".