28944909 has 12 divisors (see below), whose sum is σ = 47782176. Its totient is φ = 16539912.

The previous prime is 28944907. The next prime is 28944911. The reversal of 28944909 is 90944982.

It is an interprime number because it is at equal distance from previous prime (28944907) and next prime (28944911).

It is not a de Polignac number, because 28944909 - 2¹ = 28944907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28944901) 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 11 ways as a sum of consecutive naturals, for example, 229659 + ... + 229784.

It is an arithmetic number, because the mean of its divisors is an integer number (3981848).

Almost surely, 2^28944909 is an apocalyptic number.

It is an amenable number.

28944909 is a deficient number, since it is larger than the sum of its proper divisors (18837267).

28944909 is a wasteful number, since it uses less digits than its factorization.

28944909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459456 (or 459453 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 28944909 is about 5380.0473046247. The cubic root of 28944909 is about 307.0370109616.

The spelling of 28944909 in words is "twenty-eight million, nine hundred forty-four thousand, nine hundred nine".