28093387 has 8 divisors (see below), whose sum is σ = 32161536. Its totient is φ = 24038952.

The previous prime is 28093369. The next prime is 28093391. The reversal of 28093387 is 78339082.

It is a happy number.

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

It is not a de Polignac number, because 28093387 - 2¹¹ = 28091339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28093337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1428 + ... + 7630.

It is an arithmetic number, because the mean of its divisors is an integer number (4020192).

Almost surely, 2^28093387 is an apocalyptic number.

28093387 is a deficient number, since it is larger than the sum of its proper divisors (4068149).

28093387 is an equidigital number, since it uses as much as digits as its factorization.

28093387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6857.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28093387 is about 5300.3195186705. The cubic root of 28093387 is about 303.9961153416.

The spelling of 28093387 in words is "twenty-eight million, ninety-three thousand, three hundred eighty-seven".