28851387 has 8 divisors (see below), whose sum is σ = 38498304. Its totient is φ = 19219368.

The previous prime is 28851371. The next prime is 28851391. The reversal of 28851387 is 78315882.

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 28851387 - 2⁴ = 28851371 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28851307) 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, 2098 + ... + 7880.

It is an arithmetic number, because the mean of its divisors is an integer number (4812288).

Almost surely, 2^28851387 is an apocalyptic number.

28851387 is a deficient number, since it is larger than the sum of its proper divisors (9646917).

28851387 is a wasteful number, since it uses less digits than its factorization.

28851387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7449.

The product of its digits is 107520, while the sum is 42.

The square root of 28851387 is about 5371.3487133121. The cubic root of 28851387 is about 306.7059717789.

The spelling of 28851387 in words is "twenty-eight million, eight hundred fifty-one thousand, three hundred eighty-seven".