68112749 has 4 divisors (see below), whose sum is σ = 68151936. Its totient is φ = 68073564.

The previous prime is 68112703. The next prime is 68112757. The reversal of 68112749 is 94721186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68112749 - 2⁸ = 68112493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68112769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16859 + ... + 20504.

It is an arithmetic number, because the mean of its divisors is an integer number (17037984).

Almost surely, 2^68112749 is an apocalyptic number.

It is an amenable number.

68112749 is a deficient number, since it is larger than the sum of its proper divisors (39187).

68112749 is a wasteful number, since it uses less digits than its factorization.

68112749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39186.

The product of its digits is 24192, while the sum is 38.

The square root of 68112749 is about 8253.0448320605. The cubic root of 68112749 is about 408.3909751012.

The spelling of 68112749 in words is "sixty-eight million, one hundred twelve thousand, seven hundred forty-nine".