28775484 has 54 divisors (see below), whose sum is σ = 76088376. Its totient is φ = 9168720.

The previous prime is 28775477. The next prime is 28775491. The reversal of 28775484 is 48457782.

It is an interprime number because it is at equal distance from previous prime (28775477) and next prime (28775491).

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 18289 + ... + 19799.

It is an arithmetic number, because the mean of its divisors is an integer number (1409044).

Almost surely, 2^28775484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28775484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38044188).

28775484 is an abundant number, since it is smaller than the sum of its proper divisors (47312892).

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

28775484 is a wasteful number, since it uses less digits than its factorization.

28775484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567 (or 1539 counting only the distinct ones).

The product of its digits is 501760, while the sum is 45.

The square root of 28775484 is about 5364.2785162592. The cubic root of 28775484 is about 306.4367721457.

The spelling of 28775484 in words is "twenty-eight million, seven hundred seventy-five thousand, four hundred eighty-four".