28491582 has 16 divisors (see below), whose sum is σ = 65123712. Its totient is φ = 8140440.

The previous prime is 28491577. The next prime is 28491599. The reversal of 28491582 is 28519482.

It is a self number, because there is not a number n which added to its sum of digits gives 28491582.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339144 + ... + 339227.

It is an arithmetic number, because the mean of its divisors is an integer number (4070232).

Almost surely, 2^28491582 is an apocalyptic number.

28491582 is an abundant number, since it is smaller than the sum of its proper divisors (36632130).

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

28491582 is a wasteful number, since it uses less digits than its factorization.

28491582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678383.

The product of its digits is 46080, while the sum is 39.

The square root of 28491582 is about 5337.7506498524. The cubic root of 28491582 is about 305.4256602601.

The spelling of 28491582 in words is "twenty-eight million, four hundred ninety-one thousand, five hundred eighty-two".