28965321 has 48 divisors (see below), whose sum is σ = 53289600. Its totient is φ = 15029280.

The previous prime is 28965281. The next prime is 28965323. The reversal of 28965321 is 12356982.

It is not a de Polignac number, because 28965321 - 2⁹ = 28964809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28965323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33531 + ... + 34383.

It is an arithmetic number, because the mean of its divisors is an integer number (1110200).

Almost surely, 2^28965321 is an apocalyptic number.

28965321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28965321 is a deficient number, since it is larger than the sum of its proper divisors (24324279).

28965321 is a wasteful number, since it uses less digits than its factorization.

28965321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 874 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28965321 is about 5381.9439796416. The cubic root of 28965321 is about 307.1091683465.

The spelling of 28965321 in words is "twenty-eight million, nine hundred sixty-five thousand, three hundred twenty-one".