28851505 has 8 divisors (see below), whose sum is σ = 34804224. Its totient is φ = 22959600.

The previous prime is 28851503. The next prime is 28851521. The reversal of 28851505 is 50515882.

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 28851505 - 2¹ = 28851503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28851503) 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, 14151 + ... + 16060.

It is an arithmetic number, because the mean of its divisors is an integer number (4350528).

Almost surely, 2^28851505 is an apocalyptic number.

It is an amenable number.

28851505 is a deficient number, since it is larger than the sum of its proper divisors (5952719).

28851505 is a wasteful number, since it uses less digits than its factorization.

28851505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30407.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 28851505 is about 5371.3596975068. The cubic root of 28851505 is about 306.7063899131.

The spelling of 28851505 in words is "twenty-eight million, eight hundred fifty-one thousand, five hundred five".