28587811 has 8 divisors (see below), whose sum is σ = 32789504. Its totient is φ = 24415560.

The previous prime is 28587787. The next prime is 28587817. The reversal of 28587811 is 11878582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28587811 - 2¹⁹ = 28063523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28587817) 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 7 ways as a sum of consecutive naturals, for example, 5235 + ... + 9196.

It is an arithmetic number, because the mean of its divisors is an integer number (4098688).

Almost surely, 2^28587811 is an apocalyptic number.

28587811 is a deficient number, since it is larger than the sum of its proper divisors (4201693).

28587811 is a wasteful number, since it uses less digits than its factorization.

28587811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14721.

The product of its digits is 35840, while the sum is 40.

The square root of 28587811 is about 5346.7570545144. The cubic root of 28587811 is about 305.7691275471.

The spelling of 28587811 in words is "twenty-eight million, five hundred eighty-seven thousand, eight hundred eleven".