28584738 has 120 divisors (see below), whose sum is σ = 80529372. Its totient is φ = 7511616.

The previous prime is 28584737. The next prime is 28584739. The reversal of 28584738 is 83748582.

It is an interprime number because it is at equal distance from previous prime (28584737) and next prime (28584739).

It can be written as a sum of positive squares in 2 ways, for example, as 24770529 + 3814209 = 4977^2 + 1953^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28584693 and 28584702.

It is not an unprimeable number, because it can be changed into a prime (28584737) 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 59 ways as a sum of consecutive naturals, for example, 103056 + ... + 103332.

Almost surely, 2^28584738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28584738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40264686).

28584738 is an abundant number, since it is smaller than the sum of its proper divisors (51944634).

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

28584738 is a wasteful number, since it uses less digits than its factorization.

28584738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 302 counting only the distinct ones).

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

The square root of 28584738 is about 5346.4696763378. The cubic root of 28584738 is about 305.7581711037.

The spelling of 28584738 in words is "twenty-eight million, five hundred eighty-four thousand, seven hundred thirty-eight".