28913135 has 4 divisors (see below), whose sum is σ = 34695768. Its totient is φ = 23130504.

The previous prime is 28913123. The next prime is 28913149. The reversal of 28913135 is 53131982.

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 28913135 - 2¹² = 28909039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2891309 + ... + 2891318.

It is an arithmetic number, because the mean of its divisors is an integer number (8673942).

Almost surely, 2^28913135 is an apocalyptic number.

28913135 is a deficient number, since it is larger than the sum of its proper divisors (5782633).

28913135 is an equidigital number, since it uses as much as digits as its factorization.

28913135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5782632.

The product of its digits is 6480, while the sum is 32.

The square root of 28913135 is about 5377.0935457736. The cubic root of 28913135 is about 306.9246208352.

The spelling of 28913135 in words is "twenty-eight million, nine hundred thirteen thousand, one hundred thirty-five".