28647824 has 30 divisors (see below), whose sum is σ = 57512130. Its totient is φ = 13823488.

The previous prime is 28647809. The next prime is 28647833. The reversal of 28647824 is 42874682.

It can be written as a sum of positive squares in 3 ways, for example, as 2310400 + 26337424 = 1520^2 + 5132^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12392 + ... + 14520.

It is an arithmetic number, because the mean of its divisors is an integer number (1917071).

Almost surely, 2^28647824 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 28647824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28756065).

28647824 is an abundant number, since it is smaller than the sum of its proper divisors (28864306).

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

28647824 is a wasteful number, since it uses less digits than its factorization.

28647824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195 (or 2160 counting only the distinct ones).

The product of its digits is 172032, while the sum is 41.

The square root of 28647824 is about 5352.3662057075. The cubic root of 28647824 is about 305.9829400830.

The spelling of 28647824 in words is "twenty-eight million, six hundred forty-seven thousand, eight hundred twenty-four".