28681049 has 4 divisors (see below), whose sum is σ = 28787940. Its totient is φ = 28574160.

The previous prime is 28681007. The next prime is 28681063. The reversal of 28681049 is 94018682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94018682 = 2 ⋅47009341.

It can be written as a sum of positive squares in 2 ways, for example, as 10465225 + 18215824 = 3235^2 + 4268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28681049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28681649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53042 + ... + 53579.

It is an arithmetic number, because the mean of its divisors is an integer number (7196985).

Almost surely, 2^28681049 is an apocalyptic number.

It is an amenable number.

28681049 is a deficient number, since it is larger than the sum of its proper divisors (106891).

28681049 is a wasteful number, since it uses less digits than its factorization.

28681049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106890.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28681049 is about 5355.4690737600. The cubic root of 28681049 is about 306.1011847301.

The spelling of 28681049 in words is "twenty-eight million, six hundred eighty-one thousand, forty-nine".