28531071 has 6 divisors (see below), whose sum is σ = 41211560. Its totient is φ = 19020708.

The previous prime is 28531057. The next prime is 28531073. The reversal of 28531071 is 17013582.

28531071 is a `hidden beast` number, since 285 + 310 + 71 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-28531071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1585051 + ... + 1585068.

Almost surely, 2^28531071 is an apocalyptic number.

28531071 is a deficient number, since it is larger than the sum of its proper divisors (12680489).

28531071 is a wasteful number, since it uses less digits than its factorization.

28531071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3170125 (or 3170122 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 28531071 is about 5341.4483990768. The cubic root of 28531071 is about 305.5667005864.

The spelling of 28531071 in words is "twenty-eight million, five hundred thirty-one thousand, seventy-one".