28457328 has 20 divisors (see below), whose sum is σ = 73514888. Its totient is φ = 9485760.

The previous prime is 28457267. The next prime is 28457333. The reversal of 28457328 is 82375482.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296383 + ... + 296478.

Almost surely, 2^28457328 is an apocalyptic number.

It is an amenable number.

28457328 is an abundant number, since it is smaller than the sum of its proper divisors (45057560).

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

28457328 is a wasteful number, since it uses less digits than its factorization.

28457328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592872 (or 592866 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 28457328 is about 5334.5410299294. The cubic root of 28457328 is about 305.3032118584.

The spelling of 28457328 in words is "twenty-eight million, four hundred fifty-seven thousand, three hundred twenty-eight".