68713209 has 12 divisors (see below), whose sum is σ = 102675300. Its totient is φ = 44229024.

The previous prime is 68713207. The next prime is 68713219. The reversal of 68713209 is 90231786.

It can be written as a sum of positive squares in 2 ways, for example, as 58293225 + 10419984 = 7635^2 + 3228^2 .

It is not a de Polignac number, because 68713209 - 2¹ = 68713207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68713207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131374 + ... + 131895.

It is an arithmetic number, because the mean of its divisors is an integer number (8556275).

Almost surely, 2^68713209 is an apocalyptic number.

It is an amenable number.

68713209 is a deficient number, since it is larger than the sum of its proper divisors (33962091).

68713209 is a wasteful number, since it uses less digits than its factorization.

68713209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263304 (or 263301 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 68713209 is about 8289.3430982195. The cubic root of 68713209 is about 409.5875467488.

The spelling of 68713209 in words is "sixty-eight million, seven hundred thirteen thousand, two hundred nine".