28081598 has 12 divisors (see below), whose sum is σ = 43545888. Its totient is φ = 13567680.

The previous prime is 28081591. The next prime is 28081609. The reversal of 28081598 is 89518082.

It is a super-2 number, since 2×28081598² = 1577152292467208, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081591) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 41390 + ... + 42062.

It is an arithmetic number, because the mean of its divisors is an integer number (3628824).

Almost surely, 2^28081598 is an apocalyptic number.

28081598 is a deficient number, since it is larger than the sum of its proper divisors (15464290).

28081598 is an frugal number, since it uses more digits than its factorization.

28081598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 28081598 is about 5299.2072992099. The cubic root of 28081598 is about 303.9535868085.

The spelling of 28081598 in words is "twenty-eight million, eighty-one thousand, five hundred ninety-eight".