68240749 has 2 divisors, whose sum is σ = 68240750. Its totient is φ = 68240748.

The previous prime is 68240743. The next prime is 68240779. The reversal of 68240749 is 94704286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62694724 + 5546025 = 7918^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 68240749 - 2⁷ = 68240621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68240743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34120374 + 34120375.

It is an arithmetic number, because the mean of its divisors is an integer number (34120375).

Almost surely, 2^68240749 is an apocalyptic number.

It is an amenable number.

68240749 is a deficient number, since it is larger than the sum of its proper divisors (1).

68240749 is an equidigital number, since it uses as much as digits as its factorization.

68240749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 68240749 is about 8260.7959059645. The cubic root of 68240749 is about 408.6466361662.

It can be divided in two parts, 6 and 8240749, that multiplied together give a palindrome (49444494).

The spelling of 68240749 in words is "sixty-eight million, two hundred forty thousand, seven hundred forty-nine".