28251265 has 16 divisors (see below), whose sum is σ = 39404160. Its totient is φ = 19042560.

The previous prime is 28251257. The next prime is 28251281. The reversal of 28251265 is 56215282.

It is not a de Polignac number, because 28251265 - 2³ = 28251257 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 4776 + ... + 8905.

It is an arithmetic number, because the mean of its divisors is an integer number (2462760).

Almost surely, 2^28251265 is an apocalyptic number.

It is an amenable number.

28251265 is a deficient number, since it is larger than the sum of its proper divisors (11152895).

28251265 is a wasteful number, since it uses less digits than its factorization.

28251265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13752.

The product of its digits is 9600, while the sum is 31.

The square root of 28251265 is about 5315.1919062250. The cubic root of 28251265 is about 304.5645133175.

It can be divided in two parts, 28251 and 265, that multiplied together give a triangular number (7486515 = T₃₈₆₉).

The spelling of 28251265 in words is "twenty-eight million, two hundred fifty-one thousand, two hundred sixty-five".