26728439 has 8 divisors (see below), whose sum is σ = 27211872. Its totient is φ = 26248320.

The previous prime is 26728423. The next prime is 26728441. The reversal of 26728439 is 93482762.

It is a happy number.

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 26728439 - 2⁴ = 26728423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26728396 and 26728405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26728469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19862 + ... + 21164.

It is an arithmetic number, because the mean of its divisors is an integer number (3401484).

Almost surely, 2^26728439 is an apocalyptic number.

26728439 is a deficient number, since it is larger than the sum of its proper divisors (483433).

26728439 is a wasteful number, since it uses less digits than its factorization.

26728439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657.

The product of its digits is 145152, while the sum is 41.

The square root of 26728439 is about 5169.9554156685. The cubic root of 26728439 is about 298.9908275617.

It can be divided in two parts, 2672 and 8439, that added together give a palindrome (11111).

The spelling of 26728439 in words is "twenty-six million, seven hundred twenty-eight thousand, four hundred thirty-nine".