28288458 has 24 divisors (see below), whose sum is σ = 66864096. Its totient is φ = 8572200.

The previous prime is 28288439. The next prime is 28288499. The reversal of 28288458 is 85488282.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71238 + ... + 71633.

It is an arithmetic number, because the mean of its divisors is an integer number (2786004).

Almost surely, 2^28288458 is an apocalyptic number.

28288458 is an abundant number, since it is smaller than the sum of its proper divisors (38575638).

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

28288458 is a wasteful number, since it uses less digits than its factorization.

28288458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142890 (or 142887 counting only the distinct ones).

The product of its digits is 327680, while the sum is 45.

The square root of 28288458 is about 5318.6895002435. The cubic root of 28288458 is about 304.6981085221.

The spelling of 28288458 in words is "twenty-eight million, two hundred eighty-eight thousand, four hundred fifty-eight".