68715909 has 6 divisors (see below), whose sum is σ = 99256326. Its totient is φ = 45810600.

The previous prime is 68715883. The next prime is 68715923. The reversal of 68715909 is 90951786.

It can be written as a sum of positive squares in only one way, i.e., 40678884 + 28037025 = 6378^2 + 5295^2 .

It is not a de Polignac number, because 68715909 - 2¹⁷ = 68584837 is a prime.

It is a super-2 number, since 2×68715909² = 9443752299392562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68715109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3817542 + ... + 3817559.

It is an arithmetic number, because the mean of its divisors is an integer number (16542721).

Almost surely, 2^68715909 is an apocalyptic number.

It is an amenable number.

68715909 is a deficient number, since it is larger than the sum of its proper divisors (30540417).

68715909 is a wasteful number, since it uses less digits than its factorization.

68715909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7635107 (or 7635104 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 68715909 is about 8289.5059563282. The cubic root of 68715909 is about 409.5929114228.

The spelling of 68715909 in words is "sixty-eight million, seven hundred fifteen thousand, nine hundred nine".