68268749 has 2 divisors, whose sum is σ = 68268750. Its totient is φ = 68268748.

The previous prime is 68268721. The next prime is 68268757. The reversal of 68268749 is 94786286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37908649 + 30360100 = 6157^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 68268749 - 2⁸ = 68268493 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68268697 and 68268706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68268799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34134374 + 34134375.

It is an arithmetic number, because the mean of its divisors is an integer number (34134375).

Almost surely, 2^68268749 is an apocalyptic number.

It is an amenable number.

68268749 is a deficient number, since it is larger than the sum of its proper divisors (1).

68268749 is an equidigital number, since it uses as much as digits as its factorization.

68268749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The square root of 68268749 is about 8262.4904841095. The cubic root of 68268749 is about 408.7025194001.

The spelling of 68268749 in words is "sixty-eight million, two hundred sixty-eight thousand, seven hundred forty-nine".