28944945 has 32 divisors (see below), whose sum is σ = 52112640. Its totient is φ = 15431472.

The previous prime is 28944919. The next prime is 28944947. The reversal of 28944945 is 54944982.

It is not a de Polignac number, because 28944945 - 2⁸ = 28944689 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28944945.

It is not an unprimeable number, because it can be changed into a prime (28944947) 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 31 ways as a sum of consecutive naturals, for example, 9612 + ... + 12258.

It is an arithmetic number, because the mean of its divisors is an integer number (1628520).

Almost surely, 2^28944945 is an apocalyptic number.

It is an amenable number.

28944945 is a deficient number, since it is larger than the sum of its proper divisors (23167695).

28944945 is an frugal number, since it uses more digits than its factorization.

28944945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2673 (or 2655 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 28944945 is about 5380.0506503192. The cubic root of 28944945 is about 307.0371382531.

The spelling of 28944945 in words is "twenty-eight million, nine hundred forty-four thousand, nine hundred forty-five".