28028481 has 24 divisors (see below), whose sum is σ = 41196960. Its totient is φ = 16937856.

The previous prime is 28028449. The next prime is 28028491. The reversal of 28028481 is 18482082.

It is not a de Polignac number, because 28028481 - 2⁵ = 28028449 is a prime.

It is a super-2 number, since 2×28028481² = 1571191494334722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28028411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29445 + ... + 30381.

It is an arithmetic number, because the mean of its divisors is an integer number (1716540).

Almost surely, 2^28028481 is an apocalyptic number.

It is an amenable number.

28028481 is a deficient number, since it is larger than the sum of its proper divisors (13168479).

28028481 is a wasteful number, since it uses less digits than its factorization.

28028481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 28028481 is about 5294.1931396578. The cubic root of 28028481 is about 303.7618207393.

The spelling of 28028481 in words is "twenty-eight million, twenty-eight thousand, four hundred eighty-one".