28985851 has 4 divisors (see below), whose sum is σ = 28996704. Its totient is φ = 28975000.

The previous prime is 28985783. The next prime is 28985861. The reversal of 28985851 is 15858982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15858982 = 2 ⋅7929491.

It is a cyclic number.

It is not a de Polignac number, because 28985851 - 2¹⁵ = 28953083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28985861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1701 + ... + 7801.

It is an arithmetic number, because the mean of its divisors is an integer number (7249176).

Almost surely, 2^28985851 is an apocalyptic number.

28985851 is a deficient number, since it is larger than the sum of its proper divisors (10853).

28985851 is an equidigital number, since it uses as much as digits as its factorization.

28985851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10852.

The product of its digits is 230400, while the sum is 46.

The square root of 28985851 is about 5383.8509451878. The cubic root of 28985851 is about 307.1817086808.

The spelling of 28985851 in words is "twenty-eight million, nine hundred eighty-five thousand, eight hundred fifty-one".