28184772 has 144 divisors (see below), whose sum is σ = 85800960. Its totient is φ = 7043520.

The previous prime is 28184743. The next prime is 28184773. The reversal of 28184772 is 27748182.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28184772.

It is not an unprimeable number, because it can be changed into a prime (28184773) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 477679 + ... + 477737.

It is an arithmetic number, because the mean of its divisors is an integer number (595840).

Almost surely, 2^28184772 is an apocalyptic number.

28184772 is a gapful number since it is divisible by the number (22) 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 28184772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42900480).

28184772 is an abundant number, since it is smaller than the sum of its proper divisors (57616188).

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

28184772 is a wasteful number, since it uses less digits than its factorization.

28184772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 129 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 28184772 is about 5308.9332261764. The cubic root of 28184772 is about 304.3253816409.

The spelling of 28184772 in words is "twenty-eight million, one hundred eighty-four thousand, seven hundred seventy-two".