28081534 has 8 divisors (see below), whose sum is σ = 45362520. Its totient is φ = 12960696.

The previous prime is 28081523. The next prime is 28081589. The reversal of 28081534 is 43518082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28081496 and 28081505.

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 3 ways as a sum of consecutive naturals, for example, 540004 + ... + 540055.

It is an arithmetic number, because the mean of its divisors is an integer number (5670315).

Almost surely, 2^28081534 is an apocalyptic number.

28081534 is a deficient number, since it is larger than the sum of its proper divisors (17280986).

28081534 is a wasteful number, since it uses less digits than its factorization.

28081534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080074.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28081534 is about 5299.2012605675. The cubic root of 28081534 is about 303.9533558976.

The spelling of 28081534 in words is "twenty-eight million, eighty-one thousand, five hundred thirty-four".