28624205 has 4 divisors (see below), whose sum is σ = 34349052. Its totient is φ = 22899360.

The previous prime is 28624181. The next prime is 28624217. The reversal of 28624205 is 50242682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3833764 + 24790441 = 1958^2 + 4979^2 .

It is not a de Polignac number, because 28624205 - 2⁸ = 28623949 is a prime.

It is a super-2 number, since 2×28624205² = 1638690223764050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2862416 + ... + 2862425.

It is an arithmetic number, because the mean of its divisors is an integer number (8587263).

Almost surely, 2^28624205 is an apocalyptic number.

It is an amenable number.

28624205 is a deficient number, since it is larger than the sum of its proper divisors (5724847).

28624205 is an equidigital number, since it uses as much as digits as its factorization.

28624205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5724846.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 28624205 is about 5350.1593434215. The cubic root of 28624205 is about 305.8988266776.

Adding to 28624205 its reverse (50242682), we get a palindrome (78866887).

The spelling of 28624205 in words is "twenty-eight million, six hundred twenty-four thousand, two hundred five".