28355265 has 40 divisors (see below), whose sum is σ = 51827688. Its totient is φ = 14826240.

The previous prime is 28355263. The next prime is 28355267. The reversal of 28355265 is 56255382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28355263) and next prime (28355267).

It can be written as a sum of positive squares in 4 ways, for example, as 11512449 + 16842816 = 3393^2 + 4104^2 .

It is not a de Polignac number, because 28355265 - 2¹ = 28355263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28355263) 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 39 ways as a sum of consecutive naturals, for example, 20805 + ... + 22125.

Almost surely, 2^28355265 is an apocalyptic number.

It is an amenable number.

28355265 is a deficient number, since it is larger than the sum of its proper divisors (23472423).

28355265 is a wasteful number, since it uses less digits than its factorization.

28355265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391 (or 1382 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 28355265 is about 5324.9661970758. The cubic root of 28355265 is about 304.9377818084.

It can be divided in two parts, 2835 and 5265, that added together give a square (8100 = 90²).

The spelling of 28355265 in words is "twenty-eight million, three hundred fifty-five thousand, two hundred sixty-five".