28081287 has 12 divisors (see below), whose sum is σ = 43682184. Its totient is φ = 17280720.

The previous prime is 28081253. The next prime is 28081337. The reversal of 28081287 is 78218082.

It is not a de Polignac number, because 28081287 - 2⁶ = 28081223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119889 + ... + 120122.

It is an arithmetic number, because the mean of its divisors is an integer number (3640182).

Almost surely, 2^28081287 is an apocalyptic number.

28081287 is a deficient number, since it is larger than the sum of its proper divisors (15600897).

28081287 is a wasteful number, since it uses less digits than its factorization.

28081287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240030 (or 240027 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28081287 is about 5299.1779551172. The cubic root of 28081287 is about 303.9524647224.

It can be divided in two parts, 2808 and 1287, that added together give a triangular number (4095 = T₉₀).

The spelling of 28081287 in words is "twenty-eight million, eighty-one thousand, two hundred eighty-seven".