28095781 has 16 divisors (see below), whose sum is σ = 34179840. Its totient is φ = 22544640.

The previous prime is 28095779. The next prime is 28095817. The reversal of 28095781 is 18759082.

It is a cyclic number.

It is not a de Polignac number, because 28095781 - 2¹ = 28095779 is a prime.

It is a super-2 number, since 2×28095781² = 1578745819999922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28095721) 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 15 ways as a sum of consecutive naturals, for example, 26736 + ... + 27766.

It is an arithmetic number, because the mean of its divisors is an integer number (2136240).

Almost surely, 2^28095781 is an apocalyptic number.

It is an amenable number.

28095781 is a deficient number, since it is larger than the sum of its proper divisors (6084059).

28095781 is a wasteful number, since it uses less digits than its factorization.

28095781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28095781 is about 5300.5453493013. The cubic root of 28095781 is about 304.0047501855.

The spelling of 28095781 in words is "twenty-eight million, ninety-five thousand, seven hundred eighty-one".