28205156 has 24 divisors (see below), whose sum is σ = 57187200. Its totient is φ = 11921472.

The previous prime is 28205147. The next prime is 28205173. The reversal of 28205156 is 65150282.

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 7 ways as a sum of consecutive naturals, for example, 4856 + ... + 8943.

It is an arithmetic number, because the mean of its divisors is an integer number (2382800).

Almost surely, 2^28205156 is an apocalyptic number.

It is an amenable number.

28205156 is an abundant number, since it is smaller than the sum of its proper divisors (28982044).

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

28205156 is a wasteful number, since it uses less digits than its factorization.

28205156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13883 (or 13881 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 28205156 is about 5310.8526622380. The cubic root of 28205156 is about 304.3987294485.

The spelling of 28205156 in words is "twenty-eight million, two hundred five thousand, one hundred fifty-six".