28531588 has 12 divisors (see below), whose sum is σ = 51280012. Its totient is φ = 13880160.

The previous prime is 28531583. The next prime is 28531589. The reversal of 28531588 is 88513582.

It can be written as a sum of positive squares in 2 ways, for example, as 11819844 + 16711744 = 3438^2 + 4088^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28531588.

It is not an unprimeable number, because it can be changed into a prime (28531583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96243 + ... + 96538.

Almost surely, 2^28531588 is an apocalyptic number.

It is an amenable number.

28531588 is a deficient number, since it is larger than the sum of its proper divisors (22748424).

28531588 is a wasteful number, since it uses less digits than its factorization.

28531588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192822 (or 192820 counting only the distinct ones).

The product of its digits is 76800, while the sum is 40.

The square root of 28531588 is about 5341.4967939708. The cubic root of 28531588 is about 305.5685462588.

The spelling of 28531588 in words is "twenty-eight million, five hundred thirty-one thousand, five hundred eighty-eight".