28870784 has 32 divisors (see below), whose sum is σ = 58752000. Its totient is φ = 14125312.

The previous prime is 28870781. The next prime is 28870837. The reversal of 28870784 is 48707882.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3617 + ... + 8415.

It is an arithmetic number, because the mean of its divisors is an integer number (1836000).

Almost surely, 2^28870784 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 28870784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29376000).

28870784 is an abundant number, since it is smaller than the sum of its proper divisors (29881216).

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

28870784 is an equidigital number, since it uses as much as digits as its factorization.

28870784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860 (or 4848 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 44.

The square root of 28870784 is about 5373.1540085875. The cubic root of 28870784 is about 306.7746899427.

The spelling of 28870784 in words is "twenty-eight million, eight hundred seventy thousand, seven hundred eighty-four".