28944987 has 16 divisors (see below), whose sum is σ = 40608000. Its totient is φ = 18312224.

The previous prime is 28944983. The next prime is 28945001. The reversal of 28944987 is 78944982.

It is not a de Polignac number, because 28944987 - 2² = 28944983 is a prime.

It is a Smith number, since the sum of its digits (51) 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 (28944983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2314 + ... + 7952.

It is an arithmetic number, because the mean of its divisors is an integer number (2538000).

Almost surely, 2^28944987 is an apocalyptic number.

28944987 is a deficient number, since it is larger than the sum of its proper divisors (11663013).

28944987 is a wasteful number, since it uses less digits than its factorization.

28944987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5730.

The product of its digits is 1161216, while the sum is 51.

The square root of 28944987 is about 5380.0545536268. The cubic root of 28944987 is about 307.0372867598.

The spelling of 28944987 in words is "twenty-eight million, nine hundred forty-four thousand, nine hundred eighty-seven".