28255305 has 16 divisors (see below), whose sum is σ = 48686400. Its totient is φ = 13910208.

The previous prime is 28255303. The next prime is 28255313. The reversal of 28255305 is 50355282.

It is not a de Polignac number, because 28255305 - 2¹ = 28255303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28255301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72255 + ... + 72644.

It is an arithmetic number, because the mean of its divisors is an integer number (3042900).

Almost surely, 2^28255305 is an apocalyptic number.

It is an amenable number.

28255305 is a deficient number, since it is larger than the sum of its proper divisors (20431095).

28255305 is a wasteful number, since it uses less digits than its factorization.

28255305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144920.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 28255305 is about 5315.5719353612. The cubic root of 28255305 is about 304.5790304490.

The spelling of 28255305 in words is "twenty-eight million, two hundred fifty-five thousand, three hundred five".