28815424 has 63 divisors (see below), whose sum is σ = 63898653. Its totient is φ = 12883200.

The previous prime is 28815407. The next prime is 28815443. The reversal of 28815424 is 42451882.

The square root of 28815424 is 5368.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 937024 + 27878400 = 968^2 + 5280^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28815424.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 472354 + ... + 472414.

Almost surely, 2^28815424 is an apocalyptic number.

28815424 is the 5368-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28815424

28815424 is an abundant number, since it is smaller than the sum of its proper divisors (35083229).

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

28815424 is an equidigital number, since it uses as much as digits as its factorization.

28815424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 74 counting only the distinct ones).

The product of its digits is 20480, while the sum is 34.

The cubic root of 28815424 is about 306.5784833616.

The spelling of 28815424 in words is "twenty-eight million, eight hundred fifteen thousand, four hundred twenty-four".