68638243 has 2 divisors, whose sum is σ = 68638244. Its totient is φ = 68638242.

The previous prime is 68638211. The next prime is 68638291. The reversal of 68638243 is 34283686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68638243 - 2⁵ = 68638211 is a prime.

It is a super-2 number, since 2×68638243² = 9422416804254098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68638196 and 68638205.

It is not a weakly prime, because it can be changed into another prime (68638943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34319121 + 34319122.

It is an arithmetic number, because the mean of its divisors is an integer number (34319122).

Almost surely, 2^68638243 is an apocalyptic number.

68638243 is a deficient number, since it is larger than the sum of its proper divisors (1).

68638243 is an equidigital number, since it uses as much as digits as its factorization.

68638243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 40.

The square root of 68638243 is about 8284.8200342554. The cubic root of 68638243 is about 409.4385394295.

The spelling of 68638243 in words is "sixty-eight million, six hundred thirty-eight thousand, two hundred forty-three".