68457239 has 4 divisors (see below), whose sum is σ = 69913824. Its totient is φ = 67000656.

The previous prime is 68457217. The next prime is 68457241. The reversal of 68457239 is 93275486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68457239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68457239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68457299) 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 in 3 ways as a sum of consecutive naturals, for example, 728222 + ... + 728315.

It is an arithmetic number, because the mean of its divisors is an integer number (17478456).

Almost surely, 2^68457239 is an apocalyptic number.

68457239 is a deficient number, since it is larger than the sum of its proper divisors (1456585).

68457239 is a wasteful number, since it uses less digits than its factorization.

68457239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456584.

The product of its digits is 362880, while the sum is 44.

The square root of 68457239 is about 8273.8889888613. Note that the first 3 decimals coincide. The cubic root of 68457239 is about 409.0783162738.

The spelling of 68457239 in words is "sixty-eight million, four hundred fifty-seven thousand, two hundred thirty-nine".