28987135 has 4 divisors (see below), whose sum is σ = 34784568. Its totient is φ = 23189704.

The previous prime is 28987129. The next prime is 28987163. The reversal of 28987135 is 53178982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28987135 - 2¹⁷ = 28856063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28987091 and 28987100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2898709 + ... + 2898718.

It is an arithmetic number, because the mean of its divisors is an integer number (8696142).

Almost surely, 2^28987135 is an apocalyptic number.

28987135 is a deficient number, since it is larger than the sum of its proper divisors (5797433).

28987135 is an equidigital number, since it uses as much as digits as its factorization.

28987135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5797432.

The product of its digits is 120960, while the sum is 43.

The square root of 28987135 is about 5383.9701893677. The cubic root of 28987135 is about 307.1862444052.

The spelling of 28987135 in words is "twenty-eight million, nine hundred eighty-seven thousand, one hundred thirty-five".