68372309 has 2 divisors, whose sum is σ = 68372310. Its totient is φ = 68372308.

The previous prime is 68372303. The next prime is 68372323. The reversal of 68372309 is 90327386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44849809 + 23522500 = 6697^2 + 4850^2 .

It is a cyclic number.

It is not a de Polignac number, because 68372309 - 2²⁰ = 67323733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68372303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34186154 + 34186155.

It is an arithmetic number, because the mean of its divisors is an integer number (34186155).

Almost surely, 2^68372309 is an apocalyptic number.

It is an amenable number.

68372309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68372309 is an equidigital number, since it uses as much as digits as its factorization.

68372309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 68372309 is about 8268.7549848813. The cubic root of 68372309 is about 408.9090748634.

The spelling of 68372309 in words is "sixty-eight million, three hundred seventy-two thousand, three hundred nine".