28322784 has 180 divisors, whose sum is σ = 97330464. Its totient is φ = 8055936.

The previous prime is 28322783. The next prime is 28322803. The reversal of 28322784 is 48722382.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28322783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 126897 + ... + 127119.

Almost surely, 2^28322784 is an apocalyptic number.

28322784 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 28322784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48665232).

28322784 is an abundant number, since it is smaller than the sum of its proper divisors (69007680).

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

28322784 is a wasteful number, since it uses less digits than its factorization.

28322784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 235 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28322784 is about 5321.9154446496. The cubic root of 28322784 is about 304.8213017538.

The spelling of 28322784 in words is "twenty-eight million, three hundred twenty-two thousand, seven hundred eighty-four".