68228749 has 4 divisors (see below), whose sum is σ = 68552320. Its totient is φ = 67905180.

The previous prime is 68228731. The next prime is 68228759. The reversal of 68228749 is 94782286.

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 a de Polignac number, because none of the positive numbers 2^k-68228749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68228699 and 68228708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68228759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161469 + ... + 161890.

It is an arithmetic number, because the mean of its divisors is an integer number (17138080).

Almost surely, 2^68228749 is an apocalyptic number.

It is an amenable number.

68228749 is a deficient number, since it is larger than the sum of its proper divisors (323571).

68228749 is a wasteful number, since it uses less digits than its factorization.

68228749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323570.

The product of its digits is 387072, while the sum is 46.

The square root of 68228749 is about 8260.0695517653. The cubic root of 68228749 is about 408.6226815292.

The spelling of 68228749 in words is "sixty-eight million, two hundred twenty-eight thousand, seven hundred forty-nine".