28362505 has 4 divisors (see below), whose sum is σ = 34035012. Its totient is φ = 22690000.

The previous prime is 28362469. The next prime is 28362527. The reversal of 28362505 is 50526382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50526382 = 2 ⋅25263191.

It can be written as a sum of positive squares in 2 ways, for example, as 12194064 + 16168441 = 3492^2 + 4021^2 .

It is not a de Polignac number, because 28362505 - 2¹⁷ = 28231433 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2836246 + ... + 2836255.

It is an arithmetic number, because the mean of its divisors is an integer number (8508753).

Almost surely, 2^28362505 is an apocalyptic number.

It is an amenable number.

28362505 is a deficient number, since it is larger than the sum of its proper divisors (5672507).

28362505 is an equidigital number, since it uses as much as digits as its factorization.

28362505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672506.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 28362505 is about 5325.6459702087. The cubic root of 28362505 is about 304.9637330343.

Adding to 28362505 its reverse (50526382), we get a palindrome (78888887).

The spelling of 28362505 in words is "twenty-eight million, three hundred sixty-two thousand, five hundred five".