68641739 has 4 divisors (see below), whose sum is σ = 68690880. Its totient is φ = 68592600.

The previous prime is 68641711. The next prime is 68641751. The reversal of 68641739 is 93714686.

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

It is a cyclic number.

It is not a de Polignac number, because 68641739 - 2⁸ = 68641483 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 68641739.

It is not an unprimeable number, because it can be changed into a prime (68641789) 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, 22412 + ... + 25289.

It is an arithmetic number, because the mean of its divisors is an integer number (17172720).

Almost surely, 2^68641739 is an apocalyptic number.

68641739 is a deficient number, since it is larger than the sum of its proper divisors (49141).

68641739 is a wasteful number, since it uses less digits than its factorization.

68641739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49140.

The product of its digits is 217728, while the sum is 44.

The square root of 68641739 is about 8285.0310198574. The cubic root of 68641739 is about 409.4454907187.

The spelling of 68641739 in words is "sixty-eight million, six hundred forty-one thousand, seven hundred thirty-nine".