28815472 has 20 divisors (see below), whose sum is σ = 63805936. Its totient is φ = 12349440.

The previous prime is 28815469. The next prime is 28815491. The reversal of 28815472 is 27451882.

28815472 is nontrivially palindromic in base 5.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128529 + ... + 128752.

Almost surely, 2^28815472 is an apocalyptic number.

It is an amenable number.

28815472 is an abundant number, since it is smaller than the sum of its proper divisors (34990464).

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

28815472 is a wasteful number, since it uses less digits than its factorization.

28815472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257296 (or 257290 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 28815472 is about 5368.0044709370. The cubic root of 28815472 is about 306.5786535917.

The spelling of 28815472 in words is "twenty-eight million, eight hundred fifteen thousand, four hundred seventy-two".