28388135 has 8 divisors (see below), whose sum is σ = 34094736. Its totient is φ = 22691200.

The previous prime is 28388131. The next prime is 28388137. The reversal of 28388135 is 53188382.

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

It is not a de Polignac number, because 28388135 - 2² = 28388131 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 (28388131) 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, 8735 + ... + 11535.

It is an arithmetic number, because the mean of its divisors is an integer number (4261842).

Almost surely, 2^28388135 is an apocalyptic number.

28388135 is a deficient number, since it is larger than the sum of its proper divisors (5706601).

28388135 is a wasteful number, since it uses less digits than its factorization.

28388135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4833.

The product of its digits is 46080, while the sum is 38.

The square root of 28388135 is about 5328.0517077070. The cubic root of 28388135 is about 305.0555663340.

The spelling of 28388135 in words is "twenty-eight million, three hundred eighty-eight thousand, one hundred thirty-five".