68102309 has 12 divisors (see below), whose sum is σ = 75262572. Its totient is φ = 61575360.

The previous prime is 68102299. The next prime is 68102339. The reversal of 68102309 is 90320186.

It can be written as a sum of positive squares in 2 ways, for example, as 58951684 + 9150625 = 7678^2 + 3025^2 .

It is not a de Polignac number, because 68102309 - 2²⁰ = 67053733 is a prime.

It is a super-2 number, since 2×68102309² = 9275848982262962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68102339) 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 11 ways as a sum of consecutive naturals, for example, 22409 + ... + 25265.

It is an arithmetic number, because the mean of its divisors is an integer number (6271881).

Almost surely, 2^68102309 is an apocalyptic number.

It is an amenable number.

68102309 is a deficient number, since it is larger than the sum of its proper divisors (7160263).

68102309 is a wasteful number, since it uses less digits than its factorization.

68102309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076 (or 3065 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 68102309 is about 8252.4123139843. The cubic root of 68102309 is about 408.3701086227.

It can be divided in two parts, 6810 and 2309, that added together give a palindrome (9119).

The spelling of 68102309 in words is "sixty-eight million, one hundred two thousand, three hundred nine".