28581648 has 20 divisors (see below), whose sum is σ = 73836048. Its totient is φ = 9527200.

The previous prime is 28581629. The next prime is 28581661. The reversal of 28581648 is 84618582.

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 3 ways as a sum of consecutive naturals, for example, 297678 + ... + 297773.

Almost surely, 2^28581648 is an apocalyptic number.

It is an amenable number.

28581648 is an abundant number, since it is smaller than the sum of its proper divisors (45254400).

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

28581648 is a wasteful number, since it uses less digits than its factorization.

28581648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595462 (or 595456 counting only the distinct ones).

The product of its digits is 122880, while the sum is 42.

The square root of 28581648 is about 5346.1806927937. The cubic root of 28581648 is about 305.7471532568.

The spelling of 28581648 in words is "twenty-eight million, five hundred eighty-one thousand, six hundred forty-eight".