68632309 has 2 divisors, whose sum is σ = 68632310. Its totient is φ = 68632308.

The previous prime is 68632271. The next prime is 68632327. The reversal of 68632309 is 90323686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66471409 + 2160900 = 8153^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 68632309 - 2¹³ = 68624117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68632379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34316154 + 34316155.

It is an arithmetic number, because the mean of its divisors is an integer number (34316155).

Almost surely, 2^68632309 is an apocalyptic number.

It is an amenable number.

68632309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68632309 is an equidigital number, since it uses as much as digits as its factorization.

68632309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 68632309 is about 8284.4619016566. The cubic root of 68632309 is about 409.4267399903.

The spelling of 68632309 in words is "sixty-eight million, six hundred thirty-two thousand, three hundred nine".