28236385 has 8 divisors (see below), whose sum is σ = 34131816. Its totient is φ = 22423680.

The previous prime is 28236379. The next prime is 28236389. The reversal of 28236385 is 58363282.

It can be written as a sum of positive squares in 4 ways, for example, as 904401 + 27331984 = 951^2 + 5228^2 .

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

It is not a de Polignac number, because 28236385 - 2⁵ = 28236353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28236389) 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, 19926 + ... + 21295.

It is an arithmetic number, because the mean of its divisors is an integer number (4266477).

Almost surely, 2^28236385 is an apocalyptic number.

It is an amenable number.

28236385 is a deficient number, since it is larger than the sum of its proper divisors (5895431).

28236385 is a wasteful number, since it uses less digits than its factorization.

28236385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41363.

The product of its digits is 69120, while the sum is 37.

The square root of 28236385 is about 5313.7919605495. The cubic root of 28236385 is about 304.5110323394.

The spelling of 28236385 in words is "twenty-eight million, two hundred thirty-six thousand, three hundred eighty-five".