28147284 has 192 divisors, whose sum is σ = 88704000. Its totient is φ = 7620480.

The previous prime is 28147271. The next prime is 28147297. The reversal of 28147284 is 48274182.

It is an interprime number because it is at equal distance from previous prime (28147271) and next prime (28147297).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 654567 + ... + 654609.

It is an arithmetic number, because the mean of its divisors is an integer number (462000).

Almost surely, 2^28147284 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 28147284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44352000).

28147284 is an abundant number, since it is smaller than the sum of its proper divisors (60556716).

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

28147284 is a wasteful number, since it uses less digits than its factorization.

28147284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 107 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 28147284 is about 5305.4013985749. The cubic root of 28147284 is about 304.1903960804.

The spelling of 28147284 in words is "twenty-eight million, one hundred forty-seven thousand, two hundred eighty-four".