28791444 has 24 divisors (see below), whose sum is σ = 73287648. Its totient is φ = 8724640.

The previous prime is 28791431. The next prime is 28791449. The reversal of 28791444 is 44419782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28791449) 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 7 ways as a sum of consecutive naturals, for example, 108927 + ... + 109190.

It is an arithmetic number, because the mean of its divisors is an integer number (3053652).

Almost surely, 2^28791444 is an apocalyptic number.

It is an amenable number.

28791444 is an abundant number, since it is smaller than the sum of its proper divisors (44496204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28791444 is a wasteful number, since it uses less digits than its factorization.

28791444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218135 (or 218133 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 28791444 is about 5365.7659285511. The cubic root of 28791444 is about 306.4934155829.

The spelling of 28791444 in words is "twenty-eight million, seven hundred ninety-one thousand, four hundred forty-four".