28365512 has 36 divisors (see below), whose sum is σ = 62099505. Its totient is φ = 12111456.

The previous prime is 28365473. The next prime is 28365517. The reversal of 28365512 is 21556382.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 21215236 + 7150276 = 4606^2 + 2674^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3766.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28365517) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 105314 + ... + 105582.

Almost surely, 2^28365512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28365512

28365512 is an abundant number, since it is smaller than the sum of its proper divisors (33733993).

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

28365512 is an equidigital number, since it uses as much as digits as its factorization.

28365512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 278 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 28365512 is about 5325.9282758971. The cubic root of 28365512 is about 304.9745100977.

Multiplying 28365512 by its sum of digits (32), we get a square (907696384 = 30128²).

The spelling of 28365512 in words is "twenty-eight million, three hundred sixty-five thousand, five hundred twelve".