28449784 has 32 divisors (see below), whose sum is σ = 58728240. Its totient is φ = 12812800.

The previous prime is 28449769. The next prime is 28449787. The reversal of 28449784 is 48794482.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28449787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8514 + ... + 11374.

Almost surely, 2^28449784 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 28449784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29364120).

28449784 is an abundant number, since it is smaller than the sum of its proper divisors (30278456).

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

28449784 is a wasteful number, since it uses less digits than its factorization.

28449784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991 (or 2987 counting only the distinct ones).

The product of its digits is 516096, while the sum is 46.

The square root of 28449784 is about 5333.8338931767. The cubic root of 28449784 is about 305.2762309815.

The spelling of 28449784 in words is "twenty-eight million, four hundred forty-nine thousand, seven hundred eighty-four".