28385784 has 96 divisors (see below), whose sum is σ = 93057120. Its totient is φ = 7630848.

The previous prime is 28385783. The next prime is 28385803. The reversal of 28385784 is 48758382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28385783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6912 + ... + 10224.

It is an arithmetic number, because the mean of its divisors is an integer number (969345).

Almost surely, 2^28385784 is an apocalyptic number.

28385784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28385784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46528560).

28385784 is an abundant number, since it is smaller than the sum of its proper divisors (64671336).

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

28385784 is a wasteful number, since it uses less digits than its factorization.

28385784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349 (or 3342 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 28385784 is about 5327.8310784033. The cubic root of 28385784 is about 305.0471449115.

The spelling of 28385784 in words is "twenty-eight million, three hundred eighty-five thousand, seven hundred eighty-four".