28071439 has 8 divisors (see below), whose sum is σ = 30753360. Its totient is φ = 25411200.

The previous prime is 28071413. The next prime is 28071469. The reversal of 28071439 is 93417082.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28071439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2644 + ... + 7945.

It is an arithmetic number, because the mean of its divisors is an integer number (3844170).

Almost surely, 2^28071439 is an apocalyptic number.

28071439 is a deficient number, since it is larger than the sum of its proper divisors (2681921).

28071439 is a wasteful number, since it uses less digits than its factorization.

28071439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10841.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28071439 is about 5298.2486729107. The cubic root of 28071439 is about 303.9169289122.

The spelling of 28071439 in words is "twenty-eight million, seventy-one thousand, four hundred thirty-nine".