68128439 has 8 divisors (see below), whose sum is σ = 68976480. Its totient is φ = 67284000.

The previous prime is 68128409. The next prime is 68128441. The reversal of 68128439 is 93482186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68128439 - 2²⁰ = 67079863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68128396 and 68128405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68128409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63197 + ... + 64265.

It is an arithmetic number, because the mean of its divisors is an integer number (8622060).

Almost surely, 2^68128439 is an apocalyptic number.

68128439 is a deficient number, since it is larger than the sum of its proper divisors (848041).

68128439 is a wasteful number, since it uses less digits than its factorization.

68128439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801.

The product of its digits is 82944, while the sum is 41.

The square root of 68128439 is about 8253.9953355935. The cubic root of 68128439 is about 408.4223307703.

It can be divided in two parts, 6812 and 8439, that added together give a palindrome (15251).

The spelling of 68128439 in words is "sixty-eight million, one hundred twenty-eight thousand, four hundred thirty-nine".