28505226 has 32 divisors (see below), whose sum is σ = 60635520. Its totient is φ = 8933568.

The previous prime is 28505219. The next prime is 28505237. The reversal of 28505226 is 62250582.

It is a super-2 number, since 2×28505226² = 1625095818622152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28505193 and 28505202.

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 15 ways as a sum of consecutive naturals, for example, 28995 + ... + 29961.

It is an arithmetic number, because the mean of its divisors is an integer number (1894860).

Almost surely, 2^28505226 is an apocalyptic number.

28505226 is an abundant number, since it is smaller than the sum of its proper divisors (32130294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28505226 is an equidigital number, since it uses as much as digits as its factorization.

28505226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 28505226 is about 5339.0285633250. The cubic root of 28505226 is about 305.4744063855.

The spelling of 28505226 in words is "twenty-eight million, five hundred five thousand, two hundred twenty-six".