28448784 has 180 divisors, whose sum is σ = 99118656. Its totient is φ = 7458048.

The previous prime is 28448773. The next prime is 28448801. The reversal of 28448784 is 48784482.

It is a happy number.

It is a super-2 number, since 2×28448784² = 1618666622157312, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 170269 + ... + 170435.

Almost surely, 2^28448784 is an apocalyptic number.

28448784 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 28448784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49559328).

28448784 is an abundant number, since it is smaller than the sum of its proper divisors (70669872).

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

28448784 is a wasteful number, since it uses less digits than its factorization.

28448784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 192 counting only the distinct ones).

The product of its digits is 458752, while the sum is 45.

The square root of 28448784 is about 5333.7401511510. The cubic root of 28448784 is about 305.2726541552.

It can be divided in two parts, 2844 and 8784, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 28448784 in words is "twenty-eight million, four hundred forty-eight thousand, seven hundred eighty-four".