28081547 has 12 divisors (see below), whose sum is σ = 30765960. Its totient is φ = 25616448.

The previous prime is 28081523. The next prime is 28081589. The reversal of 28081547 is 74518082.

It is not a de Polignac number, because 28081547 - 2¹⁶ = 28016011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28081507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14108 + ... + 15974.

It is an arithmetic number, because the mean of its divisors is an integer number (2563830).

Almost surely, 2^28081547 is an apocalyptic number.

28081547 is a deficient number, since it is larger than the sum of its proper divisors (2684413).

28081547 is a wasteful number, since it uses less digits than its factorization.

28081547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982 (or 1969 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28081547 is about 5299.2024871673. The cubic root of 28081547 is about 303.9534028014.

The spelling of 28081547 in words is "twenty-eight million, eighty-one thousand, five hundred forty-seven".