68639069 has 2 divisors, whose sum is σ = 68639070. Its totient is φ = 68639068.

The previous prime is 68639017. The next prime is 68639089. The reversal of 68639069 is 96093686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38278969 + 30360100 = 6187^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 68639069 - 2⁸ = 68638813 is a prime.

It is a super-2 number, since 2×68639069² = 9422643586373522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68639089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34319534 + 34319535.

It is an arithmetic number, because the mean of its divisors is an integer number (34319535).

Almost surely, 2^68639069 is an apocalyptic number.

It is an amenable number.

68639069 is a deficient number, since it is larger than the sum of its proper divisors (1).

68639069 is an equidigital number, since it uses as much as digits as its factorization.

68639069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 68639069 is about 8284.8698843132. The cubic root of 68639069 is about 409.4401818320.

The spelling of 68639069 in words is "sixty-eight million, six hundred thirty-nine thousand, sixty-nine".