28436239 has 8 divisors (see below), whose sum is σ = 31451840. Its totient is φ = 25538976.

The previous prime is 28436237. The next prime is 28436263. The reversal of 28436239 is 93263482.

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 28436239 - 2¹ = 28436237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28436198 and 28436207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28436231) 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, 29079 + ... + 30040.

It is an arithmetic number, because the mean of its divisors is an integer number (3931480).

Almost surely, 2^28436239 is an apocalyptic number.

28436239 is a deficient number, since it is larger than the sum of its proper divisors (3015601).

28436239 is a wasteful number, since it uses less digits than its factorization.

28436239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59169.

The product of its digits is 62208, while the sum is 37.

The square root of 28436239 is about 5332.5640174310. The cubic root of 28436239 is about 305.2277757461.

The spelling of 28436239 in words is "twenty-eight million, four hundred thirty-six thousand, two hundred thirty-nine".